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Inscribing Four Circles in a Triangle
Inscribe a circle in a triangle; let denote its radius. Construct tangents to the inscribed circle parallel to the sides of the triangle. Construct inscribed circles within each of the smaller triangles with radii , , and . Then .




"Inscribing Four Circles in a Triangle" from The Wolfram Demonstrations Project
 http://demonstrations.wolfram.com/InscribingFourCirclesInATriangle/
Contributed by: Jay Warendorff
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