- A70°
- B110°
- C90°
- D140°
Step-by-Step Solution
AB ∥ DC makes ∠D = 180° − 70° = 110° (co-interior). In the cyclic quadrilateral ∠B = 180° − ∠D = 70°. (A cyclic trapezium is always isosceles.)
Answer: A) 70°
ABCD is a cyclic quadrilateral with AB ∥ DC and ∠DAB = 70°. Find ∠ABC.
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