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Geometry Problem 2 with Solution. Triangle, Angles, Auxiliary Lines, 20-80 Degrees, Mobile Apps. Level: High School, College, Math Education


In a triangle ABC, angle BAO = angle OAC = 20 degrees, angle ACO = 10 degrees,and angle OCB = 30 degrees. Prove that angleOBC = 80 degrees. Try to use elementary geometry (Euclid's Elements.)


Geometry problem 2 Triangle problem about triangle, angles


See solution below

Art of Geometry Problem 2 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. See also the kaleidoscope of problem 2.

Art of problem 2 using mobile apps, iPad, iPhone

Geometric Art of problem 2

Geometric art of problem 2



See also:
Angle Bisector
Sketch of problem 2

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Last updated: Sep 19, 2014

Geometry Problem 2 Solution(s)