Laugh formula for radius of incircle of a triangle
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The radius of incircle is
r=Ats. where At = area of the triangle and s = semi-perimeter.
- R refers to the circumradius of a triangle. The circumradius is obtained by taking the distance from the circumcentre to any 1 of the vertices. The circumcentre can be found by taking the point of concurrence of the perpendicular bisectors of each side.
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