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Geometry Problem 1175: Six Tangential or Circumscribed Quadrilaterals Theorem. Level: High School, SAT Prep, College geometry.

The figure shows a quadrilateral ABCD and lines EFGH, JKLM, NKFP, and QLGR. If quadrilaterals AEFP, BNKJ, CMLQ, DRGH, and FKLG are tangential or circumscribed quadrilaterals, prove that quadrilateral ABCD is also a tangential quadrilateral. Post a solution or comment.

Six Tangential Quadrilateral Theorem 

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