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.

Explanation

To find the ratio of the surface areas of a spherical balloon when its radius increases from 7 cm to 14 cm, we can follow these steps:

### Step 1: Understand the formula for the surface area of a sphere.
The formula for the surface area \( A \) of a sphere is given by:
\[ A = 4\pi r^2 \]
where \( r \) is the radius of the sphere.
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