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Q.

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 dA dt =  


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a

k 2 8 dθ dt  

b

k 2 4 dθ dt  

c

dθ dt  

d

k dθ dt   

answer is A.

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Detailed Solution

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k=2r,A= 1 2 r 2 θ= k 2 θ 8 ⇒ dA dt = k 2 8 dθ dt  
 
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