Wipro NLTH Written Test Qs.(Quantitative Aptitude) :: Area - Discussion

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Explanation:
Height of triangle = √(13^2 - (10/2)^2) = 12
Area of triangle = r * s
where, r = radius of inscribed circle & s=(a+b+c)/2
Area of triangle = 1/2 *b*h = 1/2 *10 *12 = 60
s = (13+13+10)/2 = 18
r = area of triangle / s = 60/18 = 10/3 = 3.33