Geometry Problem 1175: Six Tangential or Circumscribed Quadrilaterals Theorem, Typography, iPad Apps

Proposition

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.


Art and Typography of Geometry Problem 1175: Six Tangential or Circumscribed Quadrilaterals Theorem, iPad Apps


Geometric Art using Mobile Apps

Geometric art is a form of art based on the use and application of geometric figures. A geometric figure is any set or combination of points, lines, surfaces and solids.

A mobile app or mobile application software is a computer program designed to run on smartphones and tablet computers.

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Original problem 1175.

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