1. 7.2 Central Angle & Arc Length

2. Arc Length  is the radian measure of the central angle s & r have same linear units r r s = Arc length  radians (not degrees!)

3. Example 1 A bicycle has wheels that are 28 inches in diameter. How far does the bicycle move as the wheels roll through an angle of 15  ? Use Arc Length

4. Wheel Animation

5. Example 1 A bicycle has wheels that are 28 inches in diameter. How far does the bicycle move as the wheels roll through an angle of 15  ? Change 15  to radians Diameter = 28Radius = ½(28) = 14 same linear units 28 Use Arc Length

6. Homework #711 Pg. 394 33 – 44 all & Worksheet 2