# Math Help - Planes

1. ## Planes

Ok, so i have a assignment where I'm supposed to descirbe planes in certain situation (ex. parralel to xz plane)

So how would you describe (in terms of the xy, zy, and xz planes), Ax + By+ Cz + D= 0 whereas A= 0 and B,C,D do not = 0

2. Originally Posted by Mtl
Ok, so i have a assignment where I'm supposed to descirbe planes in certain situation (ex. parralel to xz plane)

So how would you describe (in terms of the xy, zy, and xz planes), Ax + By+ Cz + D= 0 whereas A= 0 and B,C,D do not = 0
Work with me on this - are you familiar with vectors?

3. pretty familiar i guess.

4. Originally Posted by Mtl
pretty familiar i guess.
Then you could describe the plane Ax + By + Cz + D = 0 as being such that the vector Ai + Bj + Ck is perpendicular to it. Furthemore, you could say that it's perpendicular distance from the origin is $\frac{|D|}{\sqrt{A^2 + B^2 + C^2}}$.