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A rectangular pyramid is sliced by a plane that is perpendicular to the base of the pyramid, as shown.

What is the shape of the face formed by the slice?
pentagon
rectangle
trapezoid
triangle

Sagot :

Cross sections perpendicular to the base and through the vertex will be triangles. Below, you can see a plane cutting through the pyramid, part of the pyramid removed, and the cross section. You could also take a slice parallel to the base. Cross sections parallel to the base will be hexagons.