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There was a circular park in Defence colony at Delhi. For fencing purpose poles A, B, C and D were installed at the circumference of the park. Ram tied wires from A to B, B to C and C to D, and he managed to measure the ∠A = 100° and ∠D = 80° Point O in the middle of the park is the center of the circle.
In Fig 9.20, ABCD is a cyclic quadrilateral in which AC and BD are its diagonals. If ∠ DBC = 55° and ∠ BAC = 45°, find ∠ BCD.
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