cylindrical tin bucket has a bottom diameter of 4 decimeters and a height of 5 decimeters. What is the volume of the bucket in liters? (Iron sheet thickness is ignored)
一个圆柱形铁皮水桶的底面直径是4分米，高是5分米，这个水桶的容积是多少升．(铁皮厚度忽略不计)
<gadget id="calculator">4 / 2</gadget>
<output>2</output>

<gadget id="calculator">2 ** 2</gadget>
<output>4</output>

<gadget id="calculator">3.14 * 4 * 5</gadget>
<output>62.8</output>

<result>62.8</result>