Geometry, Theorems and Problems

Geometry Problem 1241: Quadrilateral, Four Exterior Angle Bisectors, Cyclic Quadrilateral, Circle. Mobile Apps. Level: College, High School.

In a quadrilateral ABCD, the bisectors of the exterior angles A, B, C, and D intersect at A1, B1, C1, and D1, as shown in the figure below. Prove that quadrilateral A1B1C1D1 is cyclic.

Geometry Problem 1241: Quadrilateral, Exterior Angle Bisector, Cyclic Quadrilateral, Circle. Mobile Apps.


Art of Geometry Problem 1241 using Mobile Apps. Circle Patterns.

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.

Art of problem 1241 using mobile apps, iPad, iPhone

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Last updated: Aug 1, 2016