1.

Plzz give the steps​

Answer»

You KNOW, angle of a STRAIGHT line is 180 degree

let ∠BOC  = x

and ∠COA = y

∠BOC = ∠COA + 60

x = y + 60

x + y = 180

y + y + 60 = 180

2y = 180 - 60

y = 60 => ∠COA = 60

∠BOC = y + 60 = 60+60 = 120

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