Video: Counting and Identifying the Shapes of Faces of 3D Shapes

How many faces does this shape have? How many of its faces look like this rectangle? How many faces are squares? And how many faces are circles?

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Video Transcript

How many faces does this shape have? How many of its faces look like this rectangle? How many faces are squares? And how many faces are circles?

We’re shown a model of a 3D shape. Do you know the name of this shape? It’s a cuboid or a rectangular prism. We can imagine that this cuboid is a cardboard box. And if we were to flatten the box, it would look like this. Thinking of the 3D shape in this way helps us to count its faces. How many of the faces are rectangles? There’s one, two, three, four rectangular faces.

How many of the faces are squares? There are two. How many of the faces are circles? The shape doesn’t have any circular faces. If four of its faces are rectangles and two are squares, the cuboid has six faces. Four plus two is six. The cuboid has six faces; four are rectangles, two are squares, and none are circles.

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