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A triangle has corners at (7 , 9 ), (3 ,7 ), and (4 ,8 ). What is the radius of the triangle's inscribed circle? | Socratic
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geometry - Perpendicular from incenter of a triangle to any side is equal to the radius of the incircle - Mathematics Stack Exchange
Incenter, Orthocenter, Centroid and Circumcenter Interactive - GeoGebra | PDF | Triangle | Triangle Geometry
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