# Typography of Geometry Problem 625: Triangle, Parallel Lines, Congruence, Angle Bisector, Similarity, iPad Apps

### Proposition

The figure shows a triangle ABC with AD parallel to CB, CE parallel to AB, and AD = CE. If AE and CD meet at F, prove that BF is the bisector of the angle ABC.

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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
625.