See also:

Art of problem 1439, Generative Sketching.

ABCD is a rectangle with E on AD so that CE is perpendicular to BD at H.
S_{1}, S_{2}, S_{3}, and S_{4} are the areas of circles with diameters BD, BC, CE, and
DE, respectively. Prove that S_{1}+S_{4}=S_{2}+S_{3}

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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