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If k is the diameter of a circle and A i...

If k is the diameter of a circle and A is the area of a sector of the circle whose vertical angle is `theta` then `(dA)/(dt)` =

A

`(k^(2))/(8)((d theta)/(dt))`

B

`((k^(2))/(4))((d theta)/(dt))`

C

`(d theta)/(dt)`

D

`k((d theta)/(dt))`

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A
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