### Proposition

The figure below shows three external circles A, B, and C in a plane, D,
E, and F are the intersections of the common internal tangents of circles
A,B, A,C and B,C, respectively. Prove that AF, BE, and CD are concurrent.

## Geometric Art of problem 1394: Circular 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.