# Basic Geometry

### Example 1

What is the circumference of a circle with diameter 12 cm? | To find the circumference we need to multiply the diameter by π. |

### Example 2

Find the circumference of a circle with a radius of 3 cm. |

### Example 3

Find the radius of a circle with circumference of 31.4 cm. | In this problem we need to work backwards to find the radius. We start by plugging in the information we know: |