The figure below shows a right triangle ABC (angle B = 90 degree). The excircle E corresponding to BC is tangent to BC at F. If I is the incenter and D is the midpoint of AB, prove that D, I, and F are collinear points.
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.
Original problem 1408.