Question

The radius of a spherical balloon decreases from 35 cm to 21 cm when air is pumped out of it. Find the ratio of surface areas of the balloons in the two cases and the percentage decrease in surface area.
anyone know??

Answer 1

Ratio of surface area - 2.77

Decrease percentage in surface area is - 0.4%

Surface area of a sphere is calculated using formula - 4πr²

Surface area = R1²/R2²

SA = 35²/21²

SA = 2.77

Percentage = (35-21/35)*100

Decrease in percentage = 0.4%

Answer 2

$\huge \star \mathfrak \red{Answer!!}$

Ratio of surface area - 2.77

Decrease percentage in surface area is - 0.4%

Surface area of a sphere is calculated using formula - 4πr²

Surface area = R1²/R2²

SA = 35²/21²

SA = 2.77

Percentage = (35-21/35)*100

Decrease in percentage = 0.4%

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