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Find number of degrees...

Use the equation s=rO for the following:

1. Find the number of degrees in the central angle of a circle with radius of 20 inches if the angle subtends an arc of 13 inches.

2. Find the length of a degree on the equator considering the diameter of the equator to be 7912 miles.

3. A bicycle has a 28 inch wheel. How many revolutions will the wheel make when the bicycle travels one mile?