Area of Polyhedra Using Nets

Polyhedrons and Nets Review

March 11th, 2021

9.1 Polyhedrons

A polyhedron is a 3D figure that is formed by polygons.

Examples of polyhedrons include a cube, prism, or pyramid. Non-polyhedrons are cones, spheres, and cylinders because they have sides that are not polygons.

Multiple Choice

Which two figures are NOT polyhedra?

• A and B

• B and C

• D and A

• C and E

Prisms vs. Pyramids

A prism is a polyhedron with two congruent bases and the lateral sides are rectangles.

A pyramid is a polyhedron with one base and all the lateral sides meet at a common vertex.

Note: All prisms and pyramids are named by their bases.

Multiple Choice

The 3D figures shown are…

• prisms

• pyramids

Multiple Choice

The 3D figures shown are…

• prisms

• pyramids

9.2 Nets of 3D Shapes

A net is an unfolded, flat representation of the sides of a 3D shape.

Note: There are several different nets of any polyhedron.

Multiple Choice

Which of the following is the net of a CONE?