Asked by Drake

In triangle ABC, ∠A=20∘ and ∠B=80∘. Let D be a point on line segment AB such that AD=BC. What is the measure (in degrees) of ∠ADC?
Answered by MathMate
See:

http://www.jiskha.com/display.cgi?id=1373027638
Answered by lin
150
Answered by MathMate
That's true, it should be the supplement of asin()=180-31.6=148 (nearest degree).
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