7. In the given figure,XY and XY' are two Xparallel tangents to acircl – InterviewSolution

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1.	7. In the given figure,XY and XY' are two Xparallel tangents to acircle with centre Oand another tangentAB with point ofcontact C intersectingXY at A and XY' at B.Prove that <AOB = 90°.>.QB一一-Y:X'
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