1. Warm up: Finding the Area of a Lateral Face Architecture. The lateral faces of the Pyramid Arena in Memphis, Tennessee, are covered with steal panels. Use the diagram of the arena to find the area of each lateral face of this regular pyramid. mynameismr.info/.../Surface%20Area%20of%20Pyramids%20&%20Cones.ppt

2. Pyramid Arena mynameismr.info/.../Surface%20Area%20of%20Pyramids%20&%20Cones.ppt

4. Surface Area of a Cone Unit 5, Lesson 5 Mrs. King With slides from www.cohs.com/.../229_9.3%20Surface%20Area%20of%20Pyramids%2 0and%20Cones%20C...

5. Pyramids and Cones

6. A cone has a circular base and a vertex that is not in the same plane as a base. In a right cone, the height meets the base at its center. The height of a cone is the perpendicular distance between the vertex and the base. The slant height of a cone is the distance between the vertex and a point on the base edge. Height Lateral Surface The vertex is directly above the center of the circle. Base r Slant Height r

7. Surface Area of a Cone Surface Area = area of base + area of sector = area of base + π(radius of base)(slant height) r

8. Lateral Area of a Cone Since Lateral Area = Surface Area – area of the base L.A. =

9. Example 1: Find the surface area of the cone to the nearest whole number. a.r = 4 slant height = 6 4 in. 6 in.

10. Example 2: Find the surface area of the cone to the nearest whole number. b. First, find the slant height. Next, r = 12, 12 ft. 5 ft.

11. On your own #1 Calculate the surface area of: S =  (7) 2 +  (7)(11.40) S = 49  + 79.80  S = 128.8 

12. On your own #2 Calculate the lateral area of: L.A. =  (5)(13) L.A. = 65  L.A. =