Defining Pi for Physics

Pi is defined as the ratio of the circumference of a circle to its diameter. A frisbee is used to show the definition of pi. The units for pi, radians, are discussed. The conversion factor between revolutions, degrees, and radians is introduced.
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This is an AP Physics 1 topic.

0:00 Intro
0:22 The definition of pi
0:49 Demonstrating the definition of pi
1:35 The units for pi (radians)
2:04 revolutions, degrees, and radians
2:28 Please use rad for radians (not r, that is for radius)

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