Question
The length of the each side of an equilateral triangle
is 21√3. The area of incircle, (cm 2 ) isSolution
Area of incircle of a ∆ = πr 2  =π(a/(2√3)) 2 = π((21√3)/(2√3)) 2   =π × (10.5)2  =(22/7) × 10.5 × 10.5 = 346.5 cm2
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