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Calculate sqrt(0.99)...

Calculate `sqrt(0.99)`

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The correct Answer is:
A
Area of disk, `A=pir^(2)` (where r= radius of disk)
`(dA)/(dt)=pi(2r(dr)/(dt))=2pir(dr)/(dt)` so `(dA)/(dt)=2pixx5/pixx0.1=1 cm^(2)//s`
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