Q12 of 141 Page 438

In the given figure, sides and of cyclic quadrilateral are produced to and respectively.

If and find the value of


∠ABC + ∠CBF = 180°[Because ABF is a straight line]


⇒ ∠ABC + 130° = 180°


⇒ ∠ABC = 50°


∴ x = ∠ABC = 50°[Exterior angle = interior opposite angle]


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