Video: Understanding Nets of 3D Shapes

You can fold a net of a shape to make that shape. This rectangular prism has 4 pink faces that are rectangles and 2 green faces that are squares. This net has some faces that are triangles and a face that is a square. What shape will it make? [A] Shape A [B] Shape B [C] Shape C.

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Video Transcript

You can fold a net of a shape to make that shape. This rectangular prism has four pink faces that are rectangles and two green faces that are squares. This net has some faces that are triangles and a face that is a square. What shape will it make? A, B, or C.

Let’s begin by looking at the rectangular prism. We can call the two green faces the base because these are the squares that make this a rectangular prism. So what makes it a prism are the four pink faces that wrap around the bases. So notice that this base is a square and the rest of the faces are triangles. So this is in a prism. These triangles fold up together to create a pyramid. So we need to choose a shape that has a square base and then made up of triangular faces around it.

Option A has a circular base. So it’s like a circular pyramid, but it’s actually called a cone. Option B has a square base and is made up of triangular faces. So that might be it. Option C has two circular bases. And if we would unfold what wraps around those circles, it would be a rectangle. So that’s actually a prism and we call that a cylinder.

Therefore, option B is our square pyramid. That is what our shape will make.

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