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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. A1C1 and B1D1 intersect at O, prove that Formula to prove.

 Geometry problem 1243 Quadrilateral, Four Exterior Angle Bisectors, Semi-sum, Angles
Art of Geometry Problem 1243 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 1243 using mobile apps, iPad, iPhone
 

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