9. In Fig. 10.13, XY and X'Y' are two parallel tangents to a circle wi – InterviewSolution

1.	9. In Fig. 10.13, XY and X'Y' are two parallel tangents to a circle with centre O andanother tangent AB with point of contact Cintersecting XY at A and X'Y' at B. Provethat < AOB = 90°.
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