1. 6.3: Surface Areas of Pyramids and Cones

2. Definition
Pyramid
A polyhedron that has a polygon for the base and the lateral faces are triangles.

3. Formula Lateral Area of a Pyramid Surface Area of a Pyramid
LA = p x l (l is the slant height)
Surface Area of a Pyramid
SA = LA + B (Area of the base)

4. Practice Find the surface area of the pyramid. LA = (1/2)pl
Find the perimeter of the base.
= 32
Find the slant height.
LA = (1/2)pl

5. Definition
Cone
Similar to a pyramid, but has a circle for a base.

6. Formula Lateral Area of a Cone Surface Area of a Cone
LA = r x l (pi times radius times slant height)
Surface Area of a Cone
SA = LA + B (Area of the Circular Base)

7. Practice Find the surface area of the cone. Find the slant height
LA = r x l
= (3.14)(15)(25)
SA = LA + B
SA =