Question 94
Let $ABC$ be a triangle with $AB = AC$ and $\angle BAC = 20^{\circ}$. Let $D$ be the point on the side $AB$ such that $\angle BCD = 70^{\circ}$. Let $E$ be the point on the side $AC$ such that $\angle CBE = 60^{\circ}$. Determine the value of the angle $\angle CDE$.