1/2 revolution. A complete revolution is 2 x pi radians.
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20 times pi There are 2 pi radians in one revolution.
One degee = (pi/180)*radian
pi radians = 180 degrees -144 degrees = (pi/180) x (-144) radians
Take 8 radians and divide it by the quantity 2 pi.
Pi radians is equivalent to 180 degrees.