Find the length of an arc subtended by a central angle measuring 1.5 radians. 20 Express, in terms of π, the length of the arc intercepted by a central angle of π 6 radian in a circle with radius 30. 21 In the diagram below, Circle 1 has radius 4, while Circle 2 has radius 6.5.

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In general the radian measure of a central angle is found by dividing the arc length s by the radius r. That is, where is measured in radians. (please note that s and r have the same unit of measurement, which means this ratio has no unit, it is