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triangles

by divya23 » Wed Jun 15, 2011 5:33 am
an equilateral triangle is inscribed in a circle.if length of arc abc = 24..wat is the approx dia of the circle.
ans = 11
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by Anurag@Gurome » Wed Jun 15, 2011 5:41 am
divya23 wrote:an equilateral triangle is inscribed in a circle.if length of arc abc = 24..wat is the approx dia of the circle.
Arc abc extends an angle of 360*2/3 = 240 degrees in the center of the circle.

Hence, perimeter of the circle = (24/240)*360 = 36

Hence, diameter of the circle = 36/pi = 36*7/22 = 126/11 ≈ 11
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