A cylindrical tin bucket without a cover is 6.28 decimeters high, and it is just a square when its side is unfolded. How big is the volume of this bucket?
一个无盖圆柱形铁皮水桶，高6.28分米，将它侧面面展开正好是正方形，这个水桶容积有多大？
<gadget id="calculator">6.28 / 3.14 / 2</gadget>
<output>1</output>

<gadget id="calculator">1 ** 2</gadget>
<output>1</output>

<gadget id="calculator">3.14 * 1 * 6.28</gadget>
<output>19.7192</output>

<result>19.7192</result>