the lesson by asking students if they are familiar with shape jackets.
Based upon their experiences in this unit, they should be able to
identify what a shape jacket is.
Pose the following questions to students.
Look at these two jackets. Which solids do you think they match?
|Jacket number 1|| ||Jacket number 2|
| || || |
The above images are available on the Shape Jackets Overhead.
Students should recognize that both jackets form triangular pyramids.
Shape Jackets Overhead
Next, introduce the formal geometry terms. A jacket for a
geometric solid that can be folded to create the surface of the solid
is called a net. A net is a way of
representing a polyhedron in two dimensions. (A net is a
two-dimensional figure with indicated lines for folding that folds into
a three-dimensional polyhedron.)
For this part of the activity, students should work with a
partner. Look at the cube. Ask students to plan how they will make a
net for a cube.
Students can use grid paper to make their nets. They should fold their nets to create a cube, making sure that an actual cube is formed.
Students should make nets for other solids, such as rectangular prisms, triangular prisms, and square pyramids.