Computer Science Canada Geometery |
| Author: | Cozzy [ Thu May 13, 2004 8:36 am ] |
| Post subject: | Geometery |
Hey anyone know how to do this problem Random point = A(-2,-1,1) Plane = 6x-7y+2z=0 a) determine a point, x, on the plane b) determine the magnitude of the projection of A(vector X) on the normal vector to the plane. c) explain the signifince of the magnitude plz show answer if u can please thx  |
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| Author: | Dan [ Thu May 13, 2004 1:55 pm ] |
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AHHHHHHHHHHHHHHHHHHHHHHHHHH not geo math, it burns my eyes!!!!!!! Why are you trouching us with such evil........  |
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| Author: | Cozzy [ Thu May 13, 2004 5:37 pm ] |
| Post subject: | come on help me |
come on dan, if u dont help me ill get tony to ban u from this site 
lol or else ill just go over 2 his house and play midnight club more BUT SOMEONE HELP ME PLEASE |
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| Author: | Dauntless [ Thu May 13, 2004 8:13 pm ] |
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Dan can't get banned...he's the CRAZY ADMIN....... Crazy, you hear me? |
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| Author: | Delos [ Thu May 13, 2004 8:49 pm ] |
| Post subject: | Re: Geometery |
Cozzy wrote: Hey anyone know how to do this problem
Random point = A(-2,-1,1) Plane = 6x-7y+2z=0 a) determine a point, x, on the plane b) determine the magnitude of the projection of A(vector X) on the normal vector to the plane. c) explain the signifince of the magnitude plz show answer if u can please thx a) Determine a couple of points on the plane. eg. the x/y/z intercepts (by setting others to 0). Then, figure out 2 direction vectors. Convert the eqn into Vector form. Bu now you already have a bunch of points. But the vector eqn is a beut for the rest of the problems. b) Just do the usual projection thing w/ dot products. c) Magnitude...what do you think it is  ! |
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| Author: | octopi [ Thu May 13, 2004 9:01 pm ] |
| Post subject: | Re: Geometery |
Cozzy wrote: Hey anyone know how to do this problem
Random point = A(-2,-1,1) Plane = 6x-7y+2z=0 a) determine a point, x, on the plane b) determine the magnitude of the projection of A(vector X) on the normal vector to the plane. c) explain the signifince of the magnitude plz show answer if u can please thx Okay, well....Part A you just need to find a few numbers that satisfy the equations. 6x-7y+2z = 0 So, you just pick random values to x, and y, and then calculate z 6(1)-7(2)+2(4) = 0 ptX=(1,2,4) the normal to the plane is (6, -7, 2) isn't it? Is part b asking us to make a vector XA? using two points? ptX(1,2,4) - ptA(-2,-1,1) vctXA(3,3,3) now project vctXA onto the normal: =dot(vctXA,NORMAL)/MAG(NORMAL) =3/sqrt(89) or, I messed up, and its 3/sqrt(27) I dunno, I suck at this class. |
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| Author: | Dan [ Thu May 13, 2004 9:01 pm ] |
| Post subject: | Re: come on help me |
Cozzy wrote: come on dan, if u dont help me ill get tony to ban u from this site
lol or else ill just go over 2 his house and play midnight club more BUT SOMEONE HELP ME PLEASE turst me you dont whont me helping you with geo math, that class is the worst i have ever done in a subject in high school. |
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