Geometry Nets - MathHelp.com - Math Help

For a complete lesson on geometry nets, go to https://www.MathHelp.com - 1000+ online math lessons featuring a personal math teacher inside every lesson! In this lesson, students learn that a net is the shape formed by "unfolding" a 3-dimensional figure, so a net shows all the faces that make up the surface area of the figure. Students are then asked to determine what type of 3-dimensional figure can be made from a given net (note that a cylinder has 2 circular bases, a pyramid has triangular faces, a cone has 1 circular base, and a prism has rectangular faces). Students are also asked to determine if a given net can be used to make a cube.

In this example, we're asked to determine which three-dimensional figure can be formed from the given net.  A net is the shape that is formed by unfolding a three-dimensional figure.  In other words, a net is composed of all of the faces of the figure.  Notice that the net shown here is composed of 4 triangles and 1 rectangle, or 4 triangular faces and one rectangular base.   The triangular faces tell us that the figure is a pyramid, and the rectangular base tells us that it's a rectangular pyramid.   So when the net is folded, it forms rectangular pyramid.  If you're ever in doubt, you can check your answer by tracing the net, cutting it out, and folding it to see what kind of a figure is formed.

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