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In the given figure, XY and X′Y′ are two parallel tangents to a circle.

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asked Mar 13, 2018 in Mathematics by paayal (26,720 points) ● 4 ● 6 ● 11
In the given figure, XY and X′Y′ are two parallel tangents to a circle with centre O and another tangent AB with point of contact C intersecting XY at A and X′Y′ at B. Prove that angle AOB = 90°.

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answered Mar 13, 2018 by sanjaydas (61,430 points) ● 5 ● 7 ● 7
selected Mar 14, 2018 by faiz
 
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