Question

A right rectangular pyramid is sliced horizontally (across) at the red line by a plane parallel to the base. What is the shape of the cross-section? vertex A base A. Cube OB. Trapezoid C. Triangle D. Rectangle

Answer 1

D. rectangle

Explanation:

You want to know the shape of a cross section parallel to the base of a rectangular pyramid.

Cross section

The cross section of a pyramid or prism taken parallel to the base will have the same shape as the base.

The cross section parallel to the base of a rectangular pyramid is a rectangle.

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Additional comment

This is true for cones and cylinders as well. Parallel to the base, the cross section is a circle, just as the base is a circle.

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