Question

Use the angle sum property to prove that​

Answer 1

∠ACB and ∠ACD form a linear pair since they represent the adjacent angles on a straight line.

Thus, ∠ACB + ∠ACD = 180° ……….(2)

Also, from the angle sum property, it follows that:

∠ACB + ∠CAB + ∠ABC = 180° ……….(3)

From equation (2) and (3) it follows that:

∠ACD = ∠CAB + ∠ABC