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\[ V = \frac{1}{3} \pi \times 4^2 \times 15 = \frac{1}{3} \pi \times 16 \times 15 = 80\pi \approx 251.33 \text{ cm}^3 \]
Total volume for 5 liters:
\[ 5000 \text{ cm}^3 \]
\[ \frac{5000}{251.33} \approx 19.89 \]
Round up to 20 cones.
The \( n \)-th term \( a_n \) is:
\[ S_{10} = 3(10)^2 + 5(10) = 300 + 50 = 350 \]
\[ S_9 = 3(9)^2 + 5(9) = 243 + 45 = 288 \]
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A circle is inscribed in a square with side length 14 cm. Calculate the area of the circle in square centimeters, then determine the area of the square not covered by the circle.