How do you find arc length?

Answer:
We know that there are 2pi radians in a full circle with radius r. We also know that the circumference (arc length) of a circle with radius r is 2pir. So we can say that:

The arc length = measure of central angle in radians x radius length.

Let
s = arc length

θ = measure of central angle in radians, and
r = radius,

then, the arc length formula has the general form:

s = θr

If θ is in degrees, then s = θ/360 x 2pir

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First answer by AmazingMath. Last edit by AmazingMath. Contributor trust: 134 [recommend contributor recommended]. Question popularity: 15 [recommend question].

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