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 re(4): Just following the rules by bob909)

Opps, did it again....

There are is the angle w in the upper triangle that will get to 90 before y does. When w = 90, z = 60.

So my revised and hopefully final answer is 60 < EDC < 70.

Posted by bob909 on 2004-11-04 17:32:13