https://www.google.co.in/searIn fig., XY and X'Y' are two parallel tan – InterviewSolution

1.	https://www.google.co.in/searIn fig., XY and X'Y' are two parallel tangentsto a circle with centre O and another tangentAB touching at C, intersecting XY at A andX,Y, at B. Prove that LAOB = 90°.Y'
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