What is the surface area of a conical metal part with a circumference of 18.84dm and a height of 15dm, which is melted and forged into a cylinder with the same height as its bottom?

The diameter 2R = 18.84 / Πr = 9.42 / Π,
The surface area of the cylinder is 18.84 × 15 + 2 Π (9.42 / Π) & #178; = 282.4 + 56.52 = 338.92 square centimeter

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