The measure of the central angle, in radians, is within the range 0 to StartFraction pi Over 2.
The radian measure of a central angle θ of a circle is defined as the ratio of the length of the arc the angle subtends, s, divided by the radius of the circle, r. Note that when s = r, we get θ expressed as one radian.
The ratio of the measure of the central angle to the measure of the entire circle is 5/2π.
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