

Online Geometry Problem 17: Right triangles, Altitude, Double Angle, Auxiliary Lines. Level: High School, Honors Geometry, College, Mathematics Education
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The figure shows right
triangles ABC
and ADC, angle ACB = 2.angle ACD, and DE perpendicular to AC.
Prove that AB = 2DE.
Art of Geometry Problem 17 using Mobile Apps. Light
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Art of Geometry Problem 17 in Motion. Light patterns
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