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Problem 60.
Isosceles triangle and angles.
Level: High School, SAT Prep, College |
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Hints:
Triangle Congruence
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In the figure below, ABC is an
isosceles triangle (AB = BC), mÐABD
= 30º, mÐDBC
= 10º, and AC = BD. Prove that:
mÐDCB
= 20º.

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