1. An exhaust pipe is shaped like a cylinder with a height of 50 inches and a radius of 2 inches. What is the lateral surface area of the exhaust pipe? Round your answer to the nearest hundredth.
Problem of the Day

2. Section 12-3a Surface Areas of Pyramids

3. Then Now Objectives You found the areas of regular polygons.
Find lateral areas and surface areas of pyramids.

4. Common Core State Standards
Content Standards
G.MG.1 – Use geometric shapes, their measures, and their properties to describe objects.
Mathematical Practices
1) Make sense of problems and persevere in solving them.
6) Attend to precision.
Common Core State Standards

5. A regular pyramid has a base that is a regular polygon and the altitude has an endpoint at the center of the base. All the lateral edges are congruent and all the lateral faces are congruent isosceles triangles. The height of each lateral face is called the slant height l of the pyramid.
Vocabulary

8. Find the lateral area and surface area of each regular pyramid
Find the lateral area and surface area of each regular pyramid. Round to the nearest tenth.
Example 1 and 2

9. Find the lateral area and surface area of each regular pyramid
Find the lateral area and surface area of each regular pyramid. Round to the nearest tenth.
Example 1 and 2

10. Find the surface area of each regular pyramid
Find the surface area of each regular pyramid. Round to the nearest tenth.
Example 3

11. p.859 #1, 7, 8, 11, 34, 46
Homework