Geometry Problems, Online Education

Problem 1101: Triangle, Parallel Lines, Circle, Incircle, Inradius, Radius, Angle. Level: High School, SAT Prep, College Geometry

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In a triangle ABC (see the figure below) DE // AC and EF //AB. If r, r1, and r2 are the inradii of triangles ABC, BDE, and EFC, respectively, prove that r = r1 + r2.
 

Problem 1101: Triangle, Parallel Lines, Circle, Incircle, Inradius, Radius, Angle
 

Home | Search | Geometry | Problems | All Problems | Open Problems | Visual Index | 1101-1110 | Triangle | Circle | Incircle | Parallel lines | Similarity | Email | Post a comment or solution | By Antonio Gutierrez
Last updated: Mar 20, 2015