Triangle ABC is isosceles with AB=AC. Point D is on side AB such that angle BCD is 70 degrees. Point E is on side AC such that angle EBC is 60 degrees. Angle ABE equals 20 degrees, and angle DCE equals 10 degrees.

Find angle EDC. Justify your answer.

(In reply to Generalization by Bractals)

With respect, I don't think the question said anything about integer values. You are inserting this as you have too many unknowns to solve the problem using the sine rule alone: we also need to apply similar triangles here. I stick by my solution - 13.535 degrees.

Posted by Jils on 2004-11-09 15:05:00