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Let us recall the formula for the circumference of a circle. That one is 2pi r. r is the radius of the circle and 2pi is the angle in radian measure subtended by the entire circle at the centre. If this is so, then any arc length 'l' will be equal to the product of the angle in radian measure subtended by the arc at the centre and the radius.

So l = theta r. Say theta is the angle subtended by the arc at the centre.

Therefrom, r = l / Theta.

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Q: How do you find radius when arc length is given?
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