A conical metal part with a bottom circumference of 18.84 decimeters and a height of 15 decimeters is melted and forged into a cylinder with the same bottom as it. What is the surface area of the cylinder in square decimeters

Equal base means that the area of the base is equal, the perimeter of the base is equal, and the area of the base must be equal
The square of 18.84x5 + 3.14x (18.84 ﹣ 3.14 ﹣ 2) x2 = 150.72 (square decimeter)

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