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Problem 353. Tangential quadrilateral, Diagonals, Incircles, Inradii.
Level: High School, College, SAT Prep.

The figure shows a tangential quadrilateral ABCD. Diagonals AC and BD meet at E. If r1, r2, r3, and r4, are the radii of the incircles of triangles ABE, BCE, CDE, and ADE, prove that Conclusion to prove.

Tangential quadrilateral, incircles, inradii



Geometry problem solving is one of the most challenging skills for students to learn. When a problem requires auxiliary construction, the difficulty of the problem increases drastically, perhaps because deciding which construction to make is an ill-structured problem. By “construction,” we mean adding geometric figures (points, lines, planes) to a problem figure that wasn’t mentioned as "given."

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