The Radii of Four Incircles

http://demonstrations.wolfram.com/The... The Wolfram Demonstrations Project contains thousands of free interactive visualizations, with new entries added daily. Let ABC be a triangle. Let DEF be parallel to AC with D on AB and E on BC. Let FGH be parallel to AB with G on BC and H on AC. Let r, r1, r2, and r3 be the radii of the incircles O, O1, O2, O3 of the triangles ABC, DBE, FEG, and CGH, respectively. Then ... Contributed by: Jay Warendorff After work by: Antonio Gutierrez