Typography of Geometry Problem 1354: Circle, Tangent Lines, Secant, Chord, Center, Parallel Lines using iPad Apps

Proposition

In the figure below, AB and AC are tangent to a circle of center O. OA cuts BC at D, AEF is a secant and ED cuts the circle at G. Prove that GF and BC are parallel.

See solution below

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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.

See also:
Original problem 1354