1. OBJ: SWBAT USE THE FORMULA FOR CIRCUMFERENCE, USE ARC LENGTHS TO FIND MEASURES AND SOLVE REAL-LIFE PROBLEMS. 11.1 Circumference and Arc Length

2. Circumference Distance around the circle Formula:

3. Example 1: Find each measure A. Circumference of a circle with radius of 9 cm. B. radius of a circle with a circumference of 26 m.

4. Example 2: Find each indicated measure A. circumference of a circle with radius of 11 in. B. diameter of a circle with circumference of 4 mm.

5. Arc Length A portion of the circumference of a circle Measure of an arc is in degrees, length in linear units Formula:

6. Example 3:

7. Example 4

8. Example 5

9. Example 6 The dimensions of a car tire are shown. To the nearest foot, how far does the tire travel when it makes 15 revolutions?

10. Example 7 A path is built around four congruent circular fields. The radius of each field is 100 feet. How long is the path? Round to the nearest hundred feet.