Calculate :

(i) ∠ADC

(ii) ∠ABC

(iii) ∠BAC

In the following figure, AB = AC; BC = CD and DE is parallel to BC. Calculate :

(i) ∠CDE

(ii) ∠DCE

In the figure, given below, AB = AC. Prove that : ∠BOC = ∠ACD.

In the figure given below, LM = LN; angle PLN = 110°. Calculate :

(i) ∠LMN

(ii) ∠MLN