# Basic Geometry

### Example 1

The base we are dealing with in this pyramid is the triangular base on the bottom. |

### Example 2

The base of this cone is a circle with a radius of 5 cm. |

### Example 3

A cone whose base has a diameter of 4 inches and a height of 8 inches is of the way full. How much empty space is left? | First we need to find the volume of the whole cone. |