The balloon is a sphere with a diameter of 1 ft. The volume \( V \) of a sphere is given by the formula:
\[ V = \frac{4}{3} \pi r^3 \]
where \( r \) is the radius. Since the diameter is 1 ft, the radius \( r \) is:
\[ r = \frac{1}{2} \text{ ft} = 0.5 \text{ ft}
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