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In Fig, 10.13, XY and X'Y' are two paral...

In Fig, 10.13, XY and X'Y' are two parallel tangents to a circle with centre O and another tangent AR with point of contact C intersecting XY at A and X'Y' at B. Prove that `angle AOB=90^@`.

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The correct Answer is:
`90^(@)`
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