In the figure and Find ∠ BOC. Here ∠ A + ∠ B + ∠ C = 180 ° (angle sum

SOLUTION

Here ∠A + ∠ B + ∠ C = 180 ° (angle sum property)

⇒ 60 ° + 20 ° + 20 ° + 60 ° + ∠ OCB = 180°

⇒ ∠ OCB = 20°

In Δ OBC

∠ OBC + ∠ OCB + ∠ BOC = 180°

20 ° + 20 ° + ∠ BOC = 180°

∠ BOC = 180° – 40° = 140°