Question

In the below fig, AOC is a line, find x.

Answer 1

Since `∠` AOB and `∠`BOC are linear pairs

`∠`AOB + `∠`BOC = 180°

⇒70° + 2x° = 180°

⇒ 2x° = 180° - 70°

⇒ 2x = 110°

⇒ x `110/2`

⇒ x = 55°