Yep, they're perpendicular as there is a 90 degree angle between them.
Hello all, just checking an answer here:
I am to use one or more of the following words to describe the relationship between the yellow plane and Side A, which is nearest and on the right hand side of the yellow plane of the rectangular prism.
Obviously they cannot be coplanar, I am under the assumption that the yellow plane and Side A are perpendicular, am I correct? Thank you all for your time