A cylindrical part with a circumference of 15.7 decimeters at the bottom, and its side is just a square

Bottom perimeter = height = 15.7
Radius = 15.7 / 3.14 * 2 = 2.5 decimeters, diameter = 5 decimeters
Volume = 3.14 * 2.5 * 2.5 * 15.7 = 308.1125 cubic decimeter
Area = 2 * 3.14 * 2.5 * 2.5 + 15.7 * 15.7
=39.25+246.49
=285.74 square decimeters

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