1.

C_(1) and C_(2) are two concentric circles with centres at O. Their radii are 12 cm and 3 cm respectively. B is the point of contact oftangents drawn to C_(2) from a point A lying on the circle C_(1). Then the area of the triangle OAB is :

Answer»

`(9 sqrt(15))/(2)` SQ. CM
`12 sqrt(15)` sq. cm
`9 sqrt(15)` sq. cm
`6 sqrt(15)` sq. cm

Answer :A


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