What is the radius of the incircle of the triangle whose sides measure 5, 12 and 13 units? Pick
A) 2 units	B) 12 units	C) 6.5 units	D) 6 units	E) 7.5 units

Rationale: 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
Answer: A