A cylindrical steel barrel 56 decimeters side expansion is a square volume?

It is known that the side expansion of a cylindrical steel barrel is square,
Can be obtained: its bottom circumference and its height is equal, is 12.56 decimeters;
The bottom radius is 12.56 △ 3.14 △ 2 = 2 decimeters,
The volume is 3.14 × 2 × 2 × 12.56 = 157.7536 square decimeters

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