1.

C_(1) and C_(2) are two concentric circles with centres at O. Their radii are 12 cm and 3 cm respectively. B and C are the points of contact of two tangents draw to C_(2) from a point A lying on the circle C_(1). Then the area of the quadrilateral ABOC is-

Answer»

`(9 SQRT(15))/(2) cm^(2)`
`12 sqrt(15) cm^(2)`
`9 sqrt(15) cm^(2)`
`6 sqrt(15) cm^(2)`

Answer :C


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