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If k is the diameter of a circle and A is the area of a sector of the circle whose vertical angle is $θ$ then $d A d t =$

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k 2 8 d θ d t

k 2 4 d θ d t

d θ d t

k d θ d t

answer is A.

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Detailed Solution

k = 2 r, A = 12 r 2 θ = k 2 θ 8 ⇒ d A d t = k 2 8 d θ d t

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