Question

The radius of a spherical balloon
increases from 7 cm to 14 cm after air is
being pumped into it. The ratio of surfag
area of the balloon in the two cases is:
0 4:1
O 1:5
O 1:2
O 1:3​

Answer 1

Answer:

Step-by-step explanation:

Let r1=7cm,r2=14cm

So ratio of surface areas=4π(r2)²/4π(r1)²

=14²/7

=4:1

Answer 2

Option 1 is the correct answer

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