Posted by Drake on Sunday, July 7, 2013 at 1:58am.
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?

Math (Geometry)  MathMate, Sunday, July 7, 2013 at 6:12am
See:
http://www.jiskha.com/display.cgi?id=1373027638

Math (Geometry)  lin, Sunday, July 7, 2013 at 8:31am
150

Math (Geometry)  MathMate, Sunday, July 7, 2013 at 9:30am
That's true, it should be the supplement of asin()=18031.6=148 (nearest degree).
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