1. Section 12-3
Cones

2. cone
Like a pyramid except that its base is a circle instead of a polygon
Vertex
Base

3. Right cone
The segment joining the center of the base and the vertex is an altitude.

4. An Example of an oblique cone

5. The formulas for cones are related to the formulas for regular pyramids!

6. Theorem 12-7
The lateral area of a cone equals half the circumference of the base times the slant height.

7. therefore…

8. Total area
T.A. = L.A. + B

9. Theorem 12-8
The volume of a cone equals one third the area of the base times the height of the cone.