1. Warm-Up: p.22
Find the lateral area and surface area of each prism. 1.

2. Warm-Up: p.22
Find the lateral area and surface area of each prism. 2.

3. 12.2 Homework Answers: p.26 (5 – 8)7 8

4. Section 12.3 Notes: Surface Areas of Pyramids and Cones

5. Vocabulary! Regular Pyramid Lateral Faces Vertex
Regular Pyramid
A pyramid that has a base that is a regular
polygon and the altitude has an endpoint at
the center of the base.  
Lateral Faces
Vertex
Faces that meet at the vertex. In a regular
pyramid, they are all congruent isosceles
triangles.
The point where the lateral faces meet.

6. Vocabulary! Lateral Edge Slant Height
Lateral Edge
The intersection of two lateral faces.
All the lateral edges are congruent in
a regular pyramid.  
Slant Height
The height of each lateral face, ℓ.

7. Label the Regular Pyramid with the given information.

8. Lateral Area of a Regular Pyramid
Vocabulary!
Lateral Area of a Regular Pyramid

9. Example 1:
Find the lateral area of the square pyramid to the nearest tenth.

10. Surface Area of a Regular Pyramid
Vocabulary!
Surface Area of a Regular Pyramid

11. Example 2:
Find the surface area of the square pyramid to the nearest tenth.

12. Example 3:
Find the surface area of the regular pyramid to the nearest tenth.

13. You Try!
1. Find the surface area of the square pyramid.

14. You Try!
2. Find the surface area of the regular pyramid.

15. Homework Answers

17. Vocabulary!
Lateral Area of a Cone

18. Example 4:
The cone represents a conical slate roof on a house. Find the lateral area.

19. Not in workbook*
Surface Area of a Cone *

20. Example 5:
Find the surface area of the cone. Round to the nearest tenth.

21. You Try!
3. Find the surface area of the cone.

22. Using the solid and model provided, write in the formulas for each solid.
Lateral Area
Surface Area
Prism
Cylinder
Pyramid
Cone