Question

Select the BEST answer for the cross-selection shown

A. Triangle
B. Rhombus
C. Square
D. Rectangle

Answer 1

A. Triangle

Explanation:

You want the name of the shape of the cross section of a triangular pyramid.

Triangle

The blue cross section is shown as having 3 straight sides. It is a triangle.

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Additional comment

The cross section of a pyramid or prism taken parallel to a base will have the same shape as the base. The base of this triangular pyramid is a triangle, so any cross section parallel to that will have the shape of a triangle.

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