1.

Find the value of x in the figures.

Answer»

We know that ∠BOA + ∠BOC = 180°

[Linear pair: The two adjacent angles are said to form a linear pair of angles if their non–common arms are two opposite rays and sum of the angle is 180°]

60° + x° = 180°

x° = 180° – 60°

x° = 120°



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