# Geometry question (not homework)

Someone502
can planes only rise up or dip down like this?

/ Plane B
/
/
/
/

_____________________________ Plane A

or can Plane B intersect A like this?
_____________________________________
|BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB|
|BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB|
|BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB|
|BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB|
|BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB|
|BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB|
|_____________________________________|___ Plane A
|BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB|
|_____________________________________|

bad drawing but i don't know any other way.

hypermorphism
If your drawing is referring to planes intersecting at right angles, the most apparent example is the intersection of the xy-plane with the xz-plane.

Someone502
We had a problem in class that said that through a given line on plane A there is only one plane that intersects plane B (not dealing with my pictures). I thought there would be an infinite amount of planes.

Homework Helper
Someone502 said:
We had a problem in class that said that through a given line on plane A there is only one plane that intersects plane B (not dealing with my pictures). I thought there would be an infinite amount of planes.

Was there more to the problem? Imagine rotating the plane around the line where it intersects A. That will give an infinite number of planes that still intersect B.

Someone502
my teacher said that there was only one and that's what I am asking about.

Someone502
opps and the plane that intersects plane B pass through the line.

skiboka33
Are you sure he didn't say any two given planes can only intersect once? because that would make a lot more sense.

Someone502
no pretty sure

skiboka33
Well there should be infinite planes (B) that intersect with A. Just think about it. In fact, only planes which are parallel to each other won't intersect.

Someone502
ok my teacher said there was only one and i thought he was wrong but wasnt sure