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Problem 3.
Triangle, Angles. Level: High School, SAT Prep, College
geometry |
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Prove the following: if, in a triangle
ABC, median BD is such that mÐ
BAC = 3mÐ
C, and mÐ
ADB = 45°, then mÐ
C = 22.5°.
Hints:
Key theorems
Triangle congruence
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