Question

What is the shape of a

cross-section through the
vertex of a rectangular
pyramid that is
perpendicular to the base?
A) rectangle
B) triangle
C) square
D) circle​

Answer 1

B) Triangle.

Explanation:

If you find a cross section PARALLEL to the base, it is the same shape as the base.

If you find a cross section PERPENDICULAR to the base, it is the same shape as the face.

In this case, the cross section will be the same shape as the pyramid's faces, which are triangles.