Question
The length of the each side of an equilateral triangle
is 42√3. The area of incircle, (cm 2 ) isSolution
Area of incircle of a ∆ = πr 2  =π(a/(2√3)) 2 = π((42√3)/(2√3)) 2   =π × (21)2  =(22/7) × 21 × 21 = 1386  cm2
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