find the radius of an equilateral triangle with perimeter 24 units
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Radius(r) of inscribed circle= area of ∆ /half of the perimeter of the ∆. r= (√3/4×side^2)/(3×side/2) = (√3/4×24×24)/(3×24/2). r= 144√3/36 cms = 4√3 cms.