Typography of Geometry Problem 431: Quadrilateral, Midpoints of Diagonals, Transversal, iPad Apps

The figure shows a quadrilateral ABCD. E and F are the midpoints of diagonals AC and BD. Line EF intersects AB and CD at G and H, respectively. Prove that AG.DH = BG.CH.

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Geometric Art using iPad or 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.

See also:
Original problem 431.