1.

Choose the correct answer and give justification for each. In the figure XY and X^(1)Y^(1) 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^(1)Y^(1) at B then /_AOB=

Answer»

`80^(@)`
`100^(@)`
`90^(@)`
`60^(@)`

Answer :C


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