1.

In figure, AOC is a line, find x.

Answer»

From the figure, ∠AOB and ∠BOC are linear pairs,

∠AOB + ∠BOC = 180° 

70 + 2x = 180°

2x = 180° – 70° 

2x = 110° 

x = 110/2 

x = 55°

Therefore, the value of x is 55°.



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