# A triangle has corners at #(2 , 1 )#, #(3 ,3 )#, and #(1 ,2 )#. What is the radius of the triangle's inscribed circle?

##### 1 Answer

Inradius

#### Explanation:

The radius of a triangle's inscribed circle is called inradius.

Inradius formula :

1) calculate d the distance between the corners of the triangles, use the distance formula :

Given

perimeter

Since

Since triangle ABD is right-angled,

Area of triangle

Inradius