Lesson 8: Nets and 3-D Solids
Polygons are closed, two-dimensional figures made up of straight line segments (no curves).
Nets are two-dimensional figures that can be folded to create three-dimensional solids.
A prism is a solid geometric figure whose two bases are parallel to identical polygons and whose
sides are parallelograms.
A pyramid is a solid geometric figure formed by connecting a polygonal base and a point forming
triangular lateral faces. (Note: The point is sometimes referred to as the apex.)
Exercise 1: Nets
1.
Use arrows (under Shapes then Lines) to match the following nets to the picture of its solid.
Then write the name of the solid.
2. In your journal, sketch a net that will fold into a cube.
3. Below are the nets for a variety of prisms and pyramids. Classify the solids as prisms or
pyramids, and identify the shape of the base(s). Then write the name of the solid (named by
its base).
a.
b.
c.
d.
e.
f.
Exercise 2: Rectangular Prisms
Use the measurements from this rectangular prism to draw a net In your journal.
6cm
7cm
3cm
Exercise 3: Triangular Prism
Use the measurements (in cm.) from this triangular prism to draw a net in your orange journal.
Exercise 4: Pyramids
Pyramids are named for the shape of the base.
Use the measurements from this square pyramid to draw a net in your notebook.
A triangular pyramid that has equilateral triangles for faces is called a tetrahedron. Use the
measurements from this tetrahedron to draw a net in your notebook.