What is the radius of the incircle of the triangle whose sides measure 5, 12 and 13 units?  Answers
A) 2 units  B) 12 units  C) 6.5 units  D) 6 units  E) 7.5 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= 
<gadget id="calculator">15 - 13</gadget>
<output>2</output>
2 units.   Choice 2 units
<result>A</result>
What is the radius of the incircle of the triangle whose sides measure 5, 12 and 13 units?