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A variable triangle ABC is inscribed in a circle of diameter in a circle of diameter x units. At a particular instant, the rate of change in side a is $\large\frac{x}{2}$ times the rate of change in its opposite angle A. Then A=

\[\begin {array} {1 1} (1)\;\frac{\pi}{2} & \quad (2)\; \frac{\pi}{3} \\ (3)\;\frac{\pi}{4} & \quad (4)\;\frac{\pi}{6} \end {array}\]

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$(2) \large\frac{\pi}{3}$
answered Nov 7, 2013 by pady_1
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