Question

ABCD is a cyclic quadtilateral .if AB|| DC.if angle BAD=80° .Find angle BCD

Answer 1

Answer:

100°

Step-by-step explanation:

in a cyclic quadrilateral, opposite angles are supplementary

here, ∠a is opposite to ∠c

which makes ∠a + ∠c = 180°

⇒80 + ∠c = 180

⇒∠c = 100°