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The radius of a sphere is measured to be...

The radius of a sphere is measured to be `(2.1+-0.5)` cm. Calculate its surface area with error limits .

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The correct Answer is:
B, C, D
`V = 4pir^2=4pi (2.1)^2= 55.4cm^2 `
` (DeltaS)/S=2xx(DeltaR)/r rArr :. (DeltaS) =2xx(Deltar)/rxxS `
` =2xx(0.5)/(2.1)xx55.4=26.4cm^(2) `
` (S+-DeltaS)=(55.4+-26.4)cm^2`
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