Find the general equation formed by three points
$begingroup$
I have to find the general equation defined by these 3 points:
What I have tried so far:
Unfortunately, I was told that my solution is wrong and I am not sure how else to solve/approach this problem. Any help is appreciated.
vectors
$endgroup$
|
show 4 more comments
$begingroup$
I have to find the general equation defined by these 3 points:
What I have tried so far:
Unfortunately, I was told that my solution is wrong and I am not sure how else to solve/approach this problem. Any help is appreciated.
vectors
$endgroup$
$begingroup$
How do you mean 'general equation' defined by 3 points? Do you perhaps mean the equation of their (affine) plane? Or perhaps the area of the triangle $ABC$?
$endgroup$
– Berci
Jan 13 at 18:01
$begingroup$
Can you please check whether there is a typo? Over here, you mention the $z$-coordinate of point C to be $2$ but over the included picture it's $-2$.
$endgroup$
– Winged Blades of Godric
Jan 13 at 18:02
$begingroup$
@Berci I think it's the first one. I used rough translation, not English native.
$endgroup$
– user634364
Jan 13 at 18:03
$begingroup$
@WingedBladesofGodric it's -2. C=[0,-2,-2].
$endgroup$
– user634364
Jan 13 at 18:04
$begingroup$
There's also a sign error in the calculation of the value of your second determinant (the one with $j$)
$endgroup$
– Winged Blades of Godric
Jan 13 at 18:10
|
show 4 more comments
$begingroup$
I have to find the general equation defined by these 3 points:
What I have tried so far:
Unfortunately, I was told that my solution is wrong and I am not sure how else to solve/approach this problem. Any help is appreciated.
vectors
$endgroup$
I have to find the general equation defined by these 3 points:
What I have tried so far:
Unfortunately, I was told that my solution is wrong and I am not sure how else to solve/approach this problem. Any help is appreciated.
vectors
vectors
edited Jan 13 at 21:41
user634364
asked Jan 13 at 17:54
user634364user634364
44
44
$begingroup$
How do you mean 'general equation' defined by 3 points? Do you perhaps mean the equation of their (affine) plane? Or perhaps the area of the triangle $ABC$?
$endgroup$
– Berci
Jan 13 at 18:01
$begingroup$
Can you please check whether there is a typo? Over here, you mention the $z$-coordinate of point C to be $2$ but over the included picture it's $-2$.
$endgroup$
– Winged Blades of Godric
Jan 13 at 18:02
$begingroup$
@Berci I think it's the first one. I used rough translation, not English native.
$endgroup$
– user634364
Jan 13 at 18:03
$begingroup$
@WingedBladesofGodric it's -2. C=[0,-2,-2].
$endgroup$
– user634364
Jan 13 at 18:04
$begingroup$
There's also a sign error in the calculation of the value of your second determinant (the one with $j$)
$endgroup$
– Winged Blades of Godric
Jan 13 at 18:10
|
show 4 more comments
$begingroup$
How do you mean 'general equation' defined by 3 points? Do you perhaps mean the equation of their (affine) plane? Or perhaps the area of the triangle $ABC$?
$endgroup$
– Berci
Jan 13 at 18:01
$begingroup$
Can you please check whether there is a typo? Over here, you mention the $z$-coordinate of point C to be $2$ but over the included picture it's $-2$.
$endgroup$
– Winged Blades of Godric
Jan 13 at 18:02
$begingroup$
@Berci I think it's the first one. I used rough translation, not English native.
$endgroup$
– user634364
Jan 13 at 18:03
$begingroup$
@WingedBladesofGodric it's -2. C=[0,-2,-2].
$endgroup$
– user634364
Jan 13 at 18:04
$begingroup$
There's also a sign error in the calculation of the value of your second determinant (the one with $j$)
$endgroup$
– Winged Blades of Godric
Jan 13 at 18:10
$begingroup$
How do you mean 'general equation' defined by 3 points? Do you perhaps mean the equation of their (affine) plane? Or perhaps the area of the triangle $ABC$?
$endgroup$
– Berci
Jan 13 at 18:01
$begingroup$
How do you mean 'general equation' defined by 3 points? Do you perhaps mean the equation of their (affine) plane? Or perhaps the area of the triangle $ABC$?
$endgroup$
– Berci
Jan 13 at 18:01
$begingroup$
Can you please check whether there is a typo? Over here, you mention the $z$-coordinate of point C to be $2$ but over the included picture it's $-2$.
$endgroup$
– Winged Blades of Godric
Jan 13 at 18:02
$begingroup$
Can you please check whether there is a typo? Over here, you mention the $z$-coordinate of point C to be $2$ but over the included picture it's $-2$.
$endgroup$
– Winged Blades of Godric
Jan 13 at 18:02
$begingroup$
@Berci I think it's the first one. I used rough translation, not English native.
$endgroup$
– user634364
Jan 13 at 18:03
$begingroup$
@Berci I think it's the first one. I used rough translation, not English native.
$endgroup$
– user634364
Jan 13 at 18:03
$begingroup$
@WingedBladesofGodric it's -2. C=[0,-2,-2].
$endgroup$
– user634364
Jan 13 at 18:04
$begingroup$
@WingedBladesofGodric it's -2. C=[0,-2,-2].
$endgroup$
– user634364
Jan 13 at 18:04
$begingroup$
There's also a sign error in the calculation of the value of your second determinant (the one with $j$)
$endgroup$
– Winged Blades of Godric
Jan 13 at 18:10
$begingroup$
There's also a sign error in the calculation of the value of your second determinant (the one with $j$)
$endgroup$
– Winged Blades of Godric
Jan 13 at 18:10
|
show 4 more comments
3 Answers
3
active
oldest
votes
$begingroup$
Hint: Write $$vec{x}=vec{OA}+svec{AB}+tvec{AC}$$ where $s,t$ are real numbers.
$endgroup$
$begingroup$
Thanks for the hint! But I'm not really sure how to use this. What isOA
and where do I get thes
andt
from? I'd appreciate a more detailed explanation as I'm not very advanced.
$endgroup$
– user634364
Jan 13 at 18:04
$begingroup$
See here tutorial.math.lamar.edu/Classes/CalcIII/EqnsOfPlanes.aspx
$endgroup$
– Dr. Sonnhard Graubner
Jan 13 at 18:09
add a comment |
$begingroup$
Hint:
Solve
$$begin{cases}
1cdot a+1cdot b+2cdot c+d=0,
\3cdot a+1cdot b-2cdot c+d=0,
\0cdot a-2cdot b-2cdot c+d=0.
end{cases}$$
You can set one of the coefficients arbitrarily and solve for the others.
$endgroup$
add a comment |
$begingroup$
Assuming we're after the equation of the plane $ABC$, you're on the right direction.
You already found a normal vector of that plane, though missed a sign, it should be $n=(-12, {pmb +}12, -6)$, so the equation will indeed contain $-12x+12y-6y$ on one side, but the other side, which is going to be a constant, is still to be found.
For that, simply put the coordinates of a point on the $ABC$ plane (say, either $A$, $B$ or $C$) into this expression, and that will give you the constant.
[If they happen not to match for any choice of $A$, $B$ or $C$, that would mean you made a mistake in your previous calculations.]
So, now it's
$$-12x+12y-6y = -12cdot{bf1}+12cdot{bf1}-6cdot{bf2} = -12$$
or, equivalently,
$$2x-2y+z=2$$
You can verify that each of $A,B,C$ indeed satisfies it.
$endgroup$
1
$begingroup$
Normal vector ought be $(-12, 12, -6)$; assuming that I've not gone crazy.
$endgroup$
– Winged Blades of Godric
Jan 13 at 18:11
$begingroup$
Yes, that makes sense. I actually didn't calculate it, relied on the posted image of the attempted solution..
$endgroup$
– Berci
Jan 13 at 18:16
$begingroup$
The part I don't understand is how to find the constant. Could you explain in a better way? With an example if possible (I don't understand all English terms). Thanks!
$endgroup$
– user634364
Jan 13 at 18:20
$begingroup$
We're looking for an equation of the form $2x-2y+z=c$, and $A$ must satisfy it, so just put in its coordinates to find $c$. If the calculations are correct, you must get the same $c$ if you put $B$'s or $C$'s coordinates.
$endgroup$
– Berci
Jan 13 at 18:22
$begingroup$
Ohh, that makes more sense, thanks a lot!
$endgroup$
– user634364
Jan 13 at 18:25
add a comment |
Your Answer
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3 Answers
3
active
oldest
votes
3 Answers
3
active
oldest
votes
active
oldest
votes
active
oldest
votes
$begingroup$
Hint: Write $$vec{x}=vec{OA}+svec{AB}+tvec{AC}$$ where $s,t$ are real numbers.
$endgroup$
$begingroup$
Thanks for the hint! But I'm not really sure how to use this. What isOA
and where do I get thes
andt
from? I'd appreciate a more detailed explanation as I'm not very advanced.
$endgroup$
– user634364
Jan 13 at 18:04
$begingroup$
See here tutorial.math.lamar.edu/Classes/CalcIII/EqnsOfPlanes.aspx
$endgroup$
– Dr. Sonnhard Graubner
Jan 13 at 18:09
add a comment |
$begingroup$
Hint: Write $$vec{x}=vec{OA}+svec{AB}+tvec{AC}$$ where $s,t$ are real numbers.
$endgroup$
$begingroup$
Thanks for the hint! But I'm not really sure how to use this. What isOA
and where do I get thes
andt
from? I'd appreciate a more detailed explanation as I'm not very advanced.
$endgroup$
– user634364
Jan 13 at 18:04
$begingroup$
See here tutorial.math.lamar.edu/Classes/CalcIII/EqnsOfPlanes.aspx
$endgroup$
– Dr. Sonnhard Graubner
Jan 13 at 18:09
add a comment |
$begingroup$
Hint: Write $$vec{x}=vec{OA}+svec{AB}+tvec{AC}$$ where $s,t$ are real numbers.
$endgroup$
Hint: Write $$vec{x}=vec{OA}+svec{AB}+tvec{AC}$$ where $s,t$ are real numbers.
answered Jan 13 at 17:59
Dr. Sonnhard GraubnerDr. Sonnhard Graubner
79.1k42867
79.1k42867
$begingroup$
Thanks for the hint! But I'm not really sure how to use this. What isOA
and where do I get thes
andt
from? I'd appreciate a more detailed explanation as I'm not very advanced.
$endgroup$
– user634364
Jan 13 at 18:04
$begingroup$
See here tutorial.math.lamar.edu/Classes/CalcIII/EqnsOfPlanes.aspx
$endgroup$
– Dr. Sonnhard Graubner
Jan 13 at 18:09
add a comment |
$begingroup$
Thanks for the hint! But I'm not really sure how to use this. What isOA
and where do I get thes
andt
from? I'd appreciate a more detailed explanation as I'm not very advanced.
$endgroup$
– user634364
Jan 13 at 18:04
$begingroup$
See here tutorial.math.lamar.edu/Classes/CalcIII/EqnsOfPlanes.aspx
$endgroup$
– Dr. Sonnhard Graubner
Jan 13 at 18:09
$begingroup$
Thanks for the hint! But I'm not really sure how to use this. What is
OA
and where do I get the s
and t
from? I'd appreciate a more detailed explanation as I'm not very advanced.$endgroup$
– user634364
Jan 13 at 18:04
$begingroup$
Thanks for the hint! But I'm not really sure how to use this. What is
OA
and where do I get the s
and t
from? I'd appreciate a more detailed explanation as I'm not very advanced.$endgroup$
– user634364
Jan 13 at 18:04
$begingroup$
See here tutorial.math.lamar.edu/Classes/CalcIII/EqnsOfPlanes.aspx
$endgroup$
– Dr. Sonnhard Graubner
Jan 13 at 18:09
$begingroup$
See here tutorial.math.lamar.edu/Classes/CalcIII/EqnsOfPlanes.aspx
$endgroup$
– Dr. Sonnhard Graubner
Jan 13 at 18:09
add a comment |
$begingroup$
Hint:
Solve
$$begin{cases}
1cdot a+1cdot b+2cdot c+d=0,
\3cdot a+1cdot b-2cdot c+d=0,
\0cdot a-2cdot b-2cdot c+d=0.
end{cases}$$
You can set one of the coefficients arbitrarily and solve for the others.
$endgroup$
add a comment |
$begingroup$
Hint:
Solve
$$begin{cases}
1cdot a+1cdot b+2cdot c+d=0,
\3cdot a+1cdot b-2cdot c+d=0,
\0cdot a-2cdot b-2cdot c+d=0.
end{cases}$$
You can set one of the coefficients arbitrarily and solve for the others.
$endgroup$
add a comment |
$begingroup$
Hint:
Solve
$$begin{cases}
1cdot a+1cdot b+2cdot c+d=0,
\3cdot a+1cdot b-2cdot c+d=0,
\0cdot a-2cdot b-2cdot c+d=0.
end{cases}$$
You can set one of the coefficients arbitrarily and solve for the others.
$endgroup$
Hint:
Solve
$$begin{cases}
1cdot a+1cdot b+2cdot c+d=0,
\3cdot a+1cdot b-2cdot c+d=0,
\0cdot a-2cdot b-2cdot c+d=0.
end{cases}$$
You can set one of the coefficients arbitrarily and solve for the others.
answered Jan 13 at 18:12
Yves DaoustYves Daoust
133k676232
133k676232
add a comment |
add a comment |
$begingroup$
Assuming we're after the equation of the plane $ABC$, you're on the right direction.
You already found a normal vector of that plane, though missed a sign, it should be $n=(-12, {pmb +}12, -6)$, so the equation will indeed contain $-12x+12y-6y$ on one side, but the other side, which is going to be a constant, is still to be found.
For that, simply put the coordinates of a point on the $ABC$ plane (say, either $A$, $B$ or $C$) into this expression, and that will give you the constant.
[If they happen not to match for any choice of $A$, $B$ or $C$, that would mean you made a mistake in your previous calculations.]
So, now it's
$$-12x+12y-6y = -12cdot{bf1}+12cdot{bf1}-6cdot{bf2} = -12$$
or, equivalently,
$$2x-2y+z=2$$
You can verify that each of $A,B,C$ indeed satisfies it.
$endgroup$
1
$begingroup$
Normal vector ought be $(-12, 12, -6)$; assuming that I've not gone crazy.
$endgroup$
– Winged Blades of Godric
Jan 13 at 18:11
$begingroup$
Yes, that makes sense. I actually didn't calculate it, relied on the posted image of the attempted solution..
$endgroup$
– Berci
Jan 13 at 18:16
$begingroup$
The part I don't understand is how to find the constant. Could you explain in a better way? With an example if possible (I don't understand all English terms). Thanks!
$endgroup$
– user634364
Jan 13 at 18:20
$begingroup$
We're looking for an equation of the form $2x-2y+z=c$, and $A$ must satisfy it, so just put in its coordinates to find $c$. If the calculations are correct, you must get the same $c$ if you put $B$'s or $C$'s coordinates.
$endgroup$
– Berci
Jan 13 at 18:22
$begingroup$
Ohh, that makes more sense, thanks a lot!
$endgroup$
– user634364
Jan 13 at 18:25
add a comment |
$begingroup$
Assuming we're after the equation of the plane $ABC$, you're on the right direction.
You already found a normal vector of that plane, though missed a sign, it should be $n=(-12, {pmb +}12, -6)$, so the equation will indeed contain $-12x+12y-6y$ on one side, but the other side, which is going to be a constant, is still to be found.
For that, simply put the coordinates of a point on the $ABC$ plane (say, either $A$, $B$ or $C$) into this expression, and that will give you the constant.
[If they happen not to match for any choice of $A$, $B$ or $C$, that would mean you made a mistake in your previous calculations.]
So, now it's
$$-12x+12y-6y = -12cdot{bf1}+12cdot{bf1}-6cdot{bf2} = -12$$
or, equivalently,
$$2x-2y+z=2$$
You can verify that each of $A,B,C$ indeed satisfies it.
$endgroup$
1
$begingroup$
Normal vector ought be $(-12, 12, -6)$; assuming that I've not gone crazy.
$endgroup$
– Winged Blades of Godric
Jan 13 at 18:11
$begingroup$
Yes, that makes sense. I actually didn't calculate it, relied on the posted image of the attempted solution..
$endgroup$
– Berci
Jan 13 at 18:16
$begingroup$
The part I don't understand is how to find the constant. Could you explain in a better way? With an example if possible (I don't understand all English terms). Thanks!
$endgroup$
– user634364
Jan 13 at 18:20
$begingroup$
We're looking for an equation of the form $2x-2y+z=c$, and $A$ must satisfy it, so just put in its coordinates to find $c$. If the calculations are correct, you must get the same $c$ if you put $B$'s or $C$'s coordinates.
$endgroup$
– Berci
Jan 13 at 18:22
$begingroup$
Ohh, that makes more sense, thanks a lot!
$endgroup$
– user634364
Jan 13 at 18:25
add a comment |
$begingroup$
Assuming we're after the equation of the plane $ABC$, you're on the right direction.
You already found a normal vector of that plane, though missed a sign, it should be $n=(-12, {pmb +}12, -6)$, so the equation will indeed contain $-12x+12y-6y$ on one side, but the other side, which is going to be a constant, is still to be found.
For that, simply put the coordinates of a point on the $ABC$ plane (say, either $A$, $B$ or $C$) into this expression, and that will give you the constant.
[If they happen not to match for any choice of $A$, $B$ or $C$, that would mean you made a mistake in your previous calculations.]
So, now it's
$$-12x+12y-6y = -12cdot{bf1}+12cdot{bf1}-6cdot{bf2} = -12$$
or, equivalently,
$$2x-2y+z=2$$
You can verify that each of $A,B,C$ indeed satisfies it.
$endgroup$
Assuming we're after the equation of the plane $ABC$, you're on the right direction.
You already found a normal vector of that plane, though missed a sign, it should be $n=(-12, {pmb +}12, -6)$, so the equation will indeed contain $-12x+12y-6y$ on one side, but the other side, which is going to be a constant, is still to be found.
For that, simply put the coordinates of a point on the $ABC$ plane (say, either $A$, $B$ or $C$) into this expression, and that will give you the constant.
[If they happen not to match for any choice of $A$, $B$ or $C$, that would mean you made a mistake in your previous calculations.]
So, now it's
$$-12x+12y-6y = -12cdot{bf1}+12cdot{bf1}-6cdot{bf2} = -12$$
or, equivalently,
$$2x-2y+z=2$$
You can verify that each of $A,B,C$ indeed satisfies it.
edited Jan 13 at 18:21
answered Jan 13 at 18:08
BerciBerci
62k23776
62k23776
1
$begingroup$
Normal vector ought be $(-12, 12, -6)$; assuming that I've not gone crazy.
$endgroup$
– Winged Blades of Godric
Jan 13 at 18:11
$begingroup$
Yes, that makes sense. I actually didn't calculate it, relied on the posted image of the attempted solution..
$endgroup$
– Berci
Jan 13 at 18:16
$begingroup$
The part I don't understand is how to find the constant. Could you explain in a better way? With an example if possible (I don't understand all English terms). Thanks!
$endgroup$
– user634364
Jan 13 at 18:20
$begingroup$
We're looking for an equation of the form $2x-2y+z=c$, and $A$ must satisfy it, so just put in its coordinates to find $c$. If the calculations are correct, you must get the same $c$ if you put $B$'s or $C$'s coordinates.
$endgroup$
– Berci
Jan 13 at 18:22
$begingroup$
Ohh, that makes more sense, thanks a lot!
$endgroup$
– user634364
Jan 13 at 18:25
add a comment |
1
$begingroup$
Normal vector ought be $(-12, 12, -6)$; assuming that I've not gone crazy.
$endgroup$
– Winged Blades of Godric
Jan 13 at 18:11
$begingroup$
Yes, that makes sense. I actually didn't calculate it, relied on the posted image of the attempted solution..
$endgroup$
– Berci
Jan 13 at 18:16
$begingroup$
The part I don't understand is how to find the constant. Could you explain in a better way? With an example if possible (I don't understand all English terms). Thanks!
$endgroup$
– user634364
Jan 13 at 18:20
$begingroup$
We're looking for an equation of the form $2x-2y+z=c$, and $A$ must satisfy it, so just put in its coordinates to find $c$. If the calculations are correct, you must get the same $c$ if you put $B$'s or $C$'s coordinates.
$endgroup$
– Berci
Jan 13 at 18:22
$begingroup$
Ohh, that makes more sense, thanks a lot!
$endgroup$
– user634364
Jan 13 at 18:25
1
1
$begingroup$
Normal vector ought be $(-12, 12, -6)$; assuming that I've not gone crazy.
$endgroup$
– Winged Blades of Godric
Jan 13 at 18:11
$begingroup$
Normal vector ought be $(-12, 12, -6)$; assuming that I've not gone crazy.
$endgroup$
– Winged Blades of Godric
Jan 13 at 18:11
$begingroup$
Yes, that makes sense. I actually didn't calculate it, relied on the posted image of the attempted solution..
$endgroup$
– Berci
Jan 13 at 18:16
$begingroup$
Yes, that makes sense. I actually didn't calculate it, relied on the posted image of the attempted solution..
$endgroup$
– Berci
Jan 13 at 18:16
$begingroup$
The part I don't understand is how to find the constant. Could you explain in a better way? With an example if possible (I don't understand all English terms). Thanks!
$endgroup$
– user634364
Jan 13 at 18:20
$begingroup$
The part I don't understand is how to find the constant. Could you explain in a better way? With an example if possible (I don't understand all English terms). Thanks!
$endgroup$
– user634364
Jan 13 at 18:20
$begingroup$
We're looking for an equation of the form $2x-2y+z=c$, and $A$ must satisfy it, so just put in its coordinates to find $c$. If the calculations are correct, you must get the same $c$ if you put $B$'s or $C$'s coordinates.
$endgroup$
– Berci
Jan 13 at 18:22
$begingroup$
We're looking for an equation of the form $2x-2y+z=c$, and $A$ must satisfy it, so just put in its coordinates to find $c$. If the calculations are correct, you must get the same $c$ if you put $B$'s or $C$'s coordinates.
$endgroup$
– Berci
Jan 13 at 18:22
$begingroup$
Ohh, that makes more sense, thanks a lot!
$endgroup$
– user634364
Jan 13 at 18:25
$begingroup$
Ohh, that makes more sense, thanks a lot!
$endgroup$
– user634364
Jan 13 at 18:25
add a comment |
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$begingroup$
How do you mean 'general equation' defined by 3 points? Do you perhaps mean the equation of their (affine) plane? Or perhaps the area of the triangle $ABC$?
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– Berci
Jan 13 at 18:01
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Can you please check whether there is a typo? Over here, you mention the $z$-coordinate of point C to be $2$ but over the included picture it's $-2$.
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– Winged Blades of Godric
Jan 13 at 18:02
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@Berci I think it's the first one. I used rough translation, not English native.
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– user634364
Jan 13 at 18:03
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@WingedBladesofGodric it's -2. C=[0,-2,-2].
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– user634364
Jan 13 at 18:04
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There's also a sign error in the calculation of the value of your second determinant (the one with $j$)
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– Winged Blades of Godric
Jan 13 at 18:10