A circular park of radius 20m is situated in a colony. Three boys Ankur, Syed and David are sitting at equal distance on its boundary each having a toy telephone in his hands to talk each other. Find the length of the string of each phone.
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Solution
Since the boys are sitting equidistant on a circular boundary they can be thought of as inscribing an equilateral triangle in the given circular park
It is known that the side of such an equilateral triangle is related to the circum-radius as follows: