Poster of Geometry Problem 1389: Triangle, 40-120-20 degree, Angle, Congruence using iPad Apps, Software

Problem

A-B-C is a 40-120-20-degree triangle. D is a point on AC so that AD = BC. Find the measure of angle ADB.
Only elementary geometry is allowed (no trigonometry). 

Poster of Geometry Problem 1389: Triangle, 40-120-20 degree, Angle, Congruence using iPad Apps, Software. Math Infographic, Tutor

See also:
Original problem 1389.


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Geometric Art using iPad or 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.
 

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