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Online Geometry Problem 2. Triangle, Angles, Auxiliary Lines, 20-80 Degrees, Mobile Apps. Level: High School, Honors Geometry, College, Mathematics Education

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



 

Geometry problem 2 Triangle problem about triangle, angles



 

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

 

See also:
Triangles
Angle Bisector
Congruence
Sketch of problem 2


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Last updated: Sep 19, 2014