# Circles

### Example 1

In the figure below, |

### Example 2

What is the circumference of a circle with radius 18 cm? |

### Example 3

What is the length of an arc with measure 78° and radius 5 m? |

### Example 4

What is the radius of an arc with measure 90° and length 31 cm? |

### Example 5

In the figure below, points |