Question

Prove that any two adjacent angle sof a paralleogram are supplementry

Answer 1

Then, AD ∥ BC and AB is a transversal. So, ∠A +∠B = 180° Similarly, ∠B +∠C = 180°, ∠C +∠D = 180° and ∠D +∠A = 180°. ... Hence, any two adjacent angles of a parallelogram are supplementary.