Question

vectors:
question below:
how will i find "q"??

Answer 1

i know how to find the vertex C, but how will i find the value of q on the coordinates of D (3,q,8) ?

Answer 2

@amistre64 @ybarrap @Hero

Answer 3

well, it IS a rectangle

Answer 4

i would move it so A is at the origin ... then I could better evaluate the rectanglness of it all

Answer 5

-1,2,3 2,6,-9 3,q,8
1-2-3 1-2-3 1-2-3
---------------------
0,0,0 3,4,-12 4,p,5

Answer 6

AB is perp tp AD

3,4,-12 * 4,p,5 = 0

Answer 7

12+4p-60 = 0

solve for p, and since q-2 = p ....

Answer 8

i followed what you did,
for p i got 12
so q-2=12, q=14?
oh ok, i got it! thanks again :)

Answer 9

yay!! :)