Simplify: \( V = \frac{1}{3} \times 3.14 \times 144 \).
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- Volume formula for a cone: \( V = \frac{1}{3} \pi r^2 h \).
- Substitute the values: \( V = \frac{1}{3} \times 3.14 \times 4^2 \times 9 \).
- Calculate: \( V = \frac{1}{3} \times 3.14 \times 16 \times 9 \).
- \( V = \frac{1}{3} \times 452.16 = 150.72 \) cubic cm.
- Given \( C = 31.4 \), solve for \( r \): \( 2 \times 3.14 \times r = 31.4 \).
- \( r = \frac{31.4}{6.28} = 5 \) cm.
