1. Surface Area of Pyramids and Cones
Lesson 7-8
Surface Area of Pyramids and Cones

2. Definition Lateral Faces- The triangular sides of a pyramid.
Slant Height - The altitude or height of each lateral face.
Lateral Area - The sum of the areas of the lateral faces.

3. Net for a square pyramid
Base
Lateral Face
Slant height

4. Net of Cone
Model of Cone r l l r

5. Formulas
Surface Area of a Cone The surface area S of a cone with slant height l and radius r is the lateral area plus the area of the base.

6. Find the surface area of the triangular pyramid.
A = 10.8 in2
5 in
5 in

7. Find the surface area of cone. Round to the nearest tenth.
4.5m
1.5 m