A cylindrical iron bucket with a bottom diameter of 4 decimeters and a height of 5 decimeters is 5 decimeters. If the iron bucket is filled with water, how many liters of water will it contain?
一个底面直径是4分米的圆柱形的无盖铁桶，高5分米，如果铁桶装满了水，那么装的水有多少升？
<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>