Online Geometry Education

Problem 395: Square, 15 Degree, Equilateral triangle

The figure shows a square ABCD with angles EBC and ECB equal 15 degrees. Prove that triangle AED is equilateral. .
 

Square, 15 degree, equilateral triangle
 

See also:
Kaleidoscope of Problem 395 base on Poincare Disk Model.

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