Video: Identifying 3D Shapes from a Description of their Faces

Pick the shape that matches the description. It has two faces that are triangles. It has three faces that are rectangles.

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Video Transcript

Pick the shape that matches the description. It has two faces that are triangles. And it has three faces that are rectangles.

We’re shown four different 3D shapes. We have to find the shape that has two faces that are triangles and three faces that are rectangles. This is a cuboid. It does have some rectangular faces, but none of its faces are triangles. We know this isn’t the shape that matches the description.

This shape is a pyramid. It does have triangular faces, but none of its faces are rectangles. This shape is also a pyramid, but one of its faces is a square. It doesn’t have any rectangular faces, so this is not the shape that matches the description either.

This must be the shape that matches the description. It does have two faces that are triangles. Does it have three faces that are rectangles? There’s one rectangular face at the bottom, another one at this side, and here’s another rectangular face. This shape does have three faces that are rectangles. This is the shape that matches the description. It has two faces that are triangles and three faces that are rectangles.

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