How many square decimeters has the surface area increased when a 2.5-meter-long cylindrical steel with a bottom diameter of 2 decimeters is divided into three sections?

3.14 × (22) 2 × 4, = 12.56 (square decimeter); a: the surface area has increased by 12.56 square decimeter

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1. Cut a 1-meter-long cylindrical steel with a bottom diameter of 2 decimeters into two sections and increase its surface area () A. 6.28 square decimeters B. 9.42 square decimeters C. 12.56 square decimeters
2. How to increase the surface area of a one meter long cylindrical steel with a bottom diameter of 2 decimeters? It's simple To be more specific, why
3. How many square decimeters has the surface area increased when a 2.5-meter-long cylindrical steel with a bottom diameter of 2 decimeters is divided into three sections?
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