One revolution around a circle is 360 degrees or 2*pi radians. To solve for revolutions, you set up the ratio of revolutions to radians as follows and solve for x:
x/(pi/2) = 1/(2*pi)
x=(pi/2)*(1/2*pi) = 1/4 revolutions
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One complete revolution is equal to (2\pi) radians. Therefore, to find out how many revolutions equal (\pi) radians, you divide (\pi) by (2\pi), which gives you (\frac{1}{2}). Thus, (\pi) radians is equivalent to half a revolution.
180
pi^2
Pi is approximately equal to 3.141592652389793238462.
Pi can't be exactly expressed as a fraction, or as a decimal. It is approximately equal to 3.14159265, but for many practical calculations you may want to round it to 3.14, or to 3.1416.