the radius of a hemispherical balloon changes from 5 cm to 15 cm find the ratio of the surface area of the balloon in the two cases.
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Surface area of a spherical balloon whose radius is 6 cm.
= 4π × 6 × 6 cm2
Surface area of a spherical balloon whose radius is 12 cm.
= 4π × 12 × 12 cm2
∴ Ration of surface areas = 4π × 6 × 6 / 4π × 12 × 12 = 1 / 4 = 1 : 4
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= 4π × 6 × 6 cm2
Surface area of a spherical balloon whose radius is 12 cm.
= 4π × 12 × 12 cm2
∴ Ration of surface areas = 4π × 6 × 6 / 4π × 12 × 12 = 1 / 4 = 1 : 4
MARK ME AS A BRAINLIEST
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