### Proposition

The figure below shows
a triangle ABC with three mutually tangent circles of centers A, B, C so
that D, E, F are the points of tangency. The diameter GH of the circle B
is parallel to AC and AH meets CG at M. Prove that the points D, M, and
E are collinear.

## Art of Problem 1402, Circle Patterns using 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.