Angles in an Isosceles Triangle
You are given an isosceles triangle ABC with side AB=AC, and angle
BAC = 20 degrees.
Place a point D on side AB.
Place a point E on side AC.
Angle CBE equals 60 degrees. Find angle CDE if:

angle BCD equals 50 degrees.

angle BCD equals 70 degrees.
Source: rec.puzzles.
Solution
Mail to Ken