F1g. 10.13n Fig. 10.13, XY and X'Y' are two parallel tangents to a cir – InterviewSolution

1.	F1g. 10.13n Fig. 10.13, XY and X'Y' are two parallel tangents to a circle with centre 0 adanother tangent AB with point of contact C intersecting XY at A and XY' at B. Pruethat AOB = 900.
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