ABCD is a cyclic trapezium such that AD||BC, if ∠ABC

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ABCD is a cyclic trapezium such that AD||BC, if ∠ABC = 70°, then the value of ∠BCD is:

1. 60°
2. 70°
3. 40°
4. 80°

Correct Option: B

On the basis of question we draw a figure of cyclic trapezium ABCD

Given , ∠ABC = 70°
∠ABC + ∠CDA = 180°
⇒ ∠CDA = 180° – 70° = 110°
∴ ∠BCD = 180° – 110° = 70°