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Jul 23rd, 2015

Area of the triangle = (1/2)bcsinA

a/sinA = 2R, or a = 2RsinA. where R is radius.
a,b,c are ths sides and A = 60 (angle between the sides ) of the
triangle.

for an equilateral triangle a = b =c and angles A=B= C = 60°. Radius R = 22 cm ( given.)

hence area of the equilateral triangle = (1/2) a^2* sin60