Diagonals of a quadrilateral ABCD bisect each other. If ÐA = 35°, determine ÐB.

Given: A = 35°

∵ diagonals of the quadrilateral ABCD bisect each other

∴ it is a parallelogram

⇒ A + B = 180°

⇒ 35° + B = 180°

⇒ B = 180° – 35°

⇒ B = 145°

Hence, B = 145°.