12.3 – Surface Area of Pyramids and Cones
Pyramid: A polyhedron with one base
Lateral Face: The faces of the solid, not including the base
Height: The perpendicular distance from the vertex to the base Slant Height: The height of one of the lateral faces
Regular Pyramid: A pyramid with a regular polygon as a base
Cone: One circular base
Surface Area of a Regular Pyramid: B is the area of the base P is the perimeter of the base
Surface Area of a Right Cone:
1. Find the lateral area of each lateral face of the regular pyramid 1. Find the lateral area of each lateral face of the regular pyramid. Then find the surface area of the pyramid. B = s2 P = 9+9+9+9 B = (9)2 P = 36 B = 81
Find the lateral area of the regular shape.
Find the surface area of the regular shape. B = s2 P = 4+4+4+4 B = (4)2 P = 16 B = 16
Find the surface area of the regular shape. (10)(5) P = 50
Find the surface area of the regular shape.
6.The surface area of the right cone is 400πm². Find the value of x. -64π -64π 8π 8π 8 m