If the radius of a sphere is measured to be ( 2 . 1 ± 0 . 05 ) cm . Calculate the surface area (in cm 2 ) .

Question

If the radius of a sphere is measured to be ( 2 . 1 ± 0 . 05 ) cm . Calculate the surface area (in cm 2 ) ., 54 . 45 ± 2 . 46, 55 . 44 ± 2 . 64, 52 . 03 ± 4 . 26, 45 . 54 ± 2 . 68

MARKS App · Accepted Answer

S = 4 πr 2 = 4 × 22 7 × ( 2 . 1 ) 2 = 55 . 44 cm 2 ΔS S = 2 Δr r ΔS = 2 Δr r S = 2 × 0 . 05 × 55 . 44 2 . 1 = 2 . 64 ∴ ΔS = ( 55 . 44 ± 2 . 64 ) cm 2

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