Q25 of 141 Page 438

In the given figure, and

Find the values of and


∠DCF = ∠DAB


⇒ x = 75° [Exterior angle is equal to the interior opposite angle.]


Now,


∠DCF + ∠DEF = 180° [Opposite angles of a cyclic quadrilateral]


⇒ x + y = 180°


⇒ 75° + y = 180°


⇒ y = 105°


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