1.

In Fig., AB, CD and EF are three lines concurrent at O. Find the value of y.

Answer»

∠AOE = ∠BOF = 5y (Vertically opposite angles) 

Also, 

∠COE + ∠AOE + ∠AOD = 180° 

So, 2y + 5y + 2y = 180° 

or, 9y = 180°, which gives y = 20°.



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