

Problem 858: Isosceles Right Triangle, Cevian, Ratio 2:1, 45 Degrees,
Congruence, Angles, Auxiliary Lines. Level: High School, SAT Prep, College geometry

The figure shows an isosceles right triangle ABC with
a point D on AC. If AD = 2 DC, find the measure of angle ADB.
Try to use elementary geometry (no
trigonometry).


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