It is usually simpler to measure it. If you really want to CALCULATE it, the calculation (and whether you can calculate it at all) depends on what other information is available.
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the length is: 2rsin(1/2 theta) where r is the radius and theta is the included angle.
This requires trigonometry If theta is the angle from the center of the circle to the edges of the chord, then chord length = 2Rsin (theta/2)
This is referred to as a chord. If the chord passes through the center of the circle, it represents the diameteror width of the circle.For a circle, the length of the diameter is the longest possible length of a chord.
There are a couple of different ways of finding the length of the chord of a circle. Probably the best is what is called the half angle formula.
R = radius c = chord length s = curve length c = 2Rsin(s/2R) you can solve for radius by trial and error as this is a transcendental equation