Question

A pentagonal prism is cut by a plane perpendicular to the base. What is the shape of the cross section that is formed?

a pentagon with one pair of equal sides
a trapezoid with one pair of parallel sides
a rectangle
a triangle
a hexagon

Answer 1

a rectangle

Explanation:

If a pentagonal prism is cut by a plane perpendicular to the base, like the blue plane in the attached imaged, the cross section will have the shape of a rectangle, like the green rectangle in the attached imaged.

Answer 2

If a pentagonal prism is cut by a plane perpendicular to the base the shape of the cross section that is formed would be a trapezoid with one pair of parallel sides.