area = inradius * perimeter
6 = 2p
p=3
The formula comes from the fact that the incenter is the intersection of the angle bisectors. Draw altitudes from the incenter, and each of the 6 interior triangles has base 1/2 of a side, and altitude = inradius.
the radius of the incircle of a triangle is 2cm. if the area of the triangle is 6 sq.cm, then its perimeter is.
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