Question

The radius of a spherical balloon increases from 7 cm to 14 cm as air is being pumped into it. Find the ratio of surface areas of the balloon in the two cases.​

Answer 1

Answer:

$let \: r \: be \: initial \: radius \: and \: (r)be \: increased \: radius \: \\ r = 7cm \\ and(r) = 14cm \\ ratio \: of \: surface \: area = \frac{4\pi \: r {}^{2} }{4\pi(r) {}^{2} } \\ so \: 7 {}^{2} \div 14 {}^{2} \\ ratio = 1 : 4$

Answer 2

Answer:

1:4

Step-by-step explanation:

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