A section of cylindrical steel with a bottom diameter of 8 cm and a height of 9 cm. Cast it into a conical part with a height of 12 cm. What is the bottom area of the part? Give me the formula! What is the simplest integer ratio of 91 out of 13?
8/2=4
3.14 * 4 * 4 * 9 / 12 * 3 = 134.235 square centimeter
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