what is the radius of the incircle of the triangle whose sides measure 5 , 12 and 13 units ?
explanatory answer in a right angled triangle , the radius of the incircle = s - h , where ' s ' is the semi perimeter of the triangle and ' r ' is the radius of the inscribed circle . the semi perimeter of the triangle = a + b + c / 2 = 5 + 12 + 13 / 2 = 15 therefore , r = 15 - 13 = 2 units . choice a
divide(multiply(5, 12), add(add(5, 12), 13))