Quadrilateral ABCD has an exterior angle at vertex A measuring

MATHEMATICS · Single correct · CBSE · Mathematics · Quadrilaterals · Quadrilaterals

Problem

Quadrilateral ABCD has an exterior angle at vertex A measuring 140∘140^{\circ}. The interior angle at vertex C is (4y−20)∘(4y-20)^{\circ}. For what value of yy will ABCD be a parallelogram? (a) 1010 (b) 1515 (c) 2020 (d) 4040

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