What is the radius of the incircle of the triangle whose sides measure 5, 12 and 13 units?

Question

triciaal · Answer

|dw:1410149281953:dw|do you recognize this is a right angle triangle?

mathstudent55 · Answer

|dw:1410149512417:dw|

anonymous · Answer

AH! yeah i get it now. I know radius of in circle is given by R=2a/p
a= area and p= perimeter.....
so i need to calculate perimeter as well as area of this Rt. angled triangle.
Thanks @triciaal  @mathstudent55

anonymous · Answer

True also u can also see that in a right angled triangle, the radius of the incircle is given by the following relation 
$$\frac{ \sum od perpendicular sides-hypotenuse }{ 2 }$$
@pathfinder_007

anonymous · Answer

yes yes i will get 5+12-13/2= 2 units(answer)
thanks @aryandecoolest