Question

5)The radius of a spherical balloon increases from 3.5cm to 7cm as
is being pumped in to it. Find the ratio of surface areas of the
in the 2 cases.
ballon
Pls tell step by step

Answer 1

Answer:

1:4

Step-by-step explanation:

surface area of a sphere = 4πr^2

let r1= 3.5 cm

r2 = 7 cm

ratio = 4π(r1)^2/4π(r2)^2

= r1^2/r2^2

= (3.5)^2/7^2

= 12.25/49

= 0.25/1

= 25/100

= 1:4

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