Typography of Geometry Problem 897: Intersecting Circles, Common External Tangent, Secant, Congruence, iPad Apps

Proposition

The circles O and O₁ intersect at A and B (see the figure below), CD is the common external tangent, CA intersects circle O₁ at E, DA intersects circle O at F. If FC and ED intersect at G, prove that GC and GD are congruent.

---

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 897