A cylindrical bucket has an inner diameter of 4 decimeters and a depth of 5 decimeters. Pour 47.1 liters of water into the bucket. What is the volume of the bucket?
一个圆柱形水桶，桶的内直径是4分米，桶深5分米，现将47.1升水倒进桶里，水占水桶容积的多少．
<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>

<gadget id="calculator">47.1 / 62.8</gadget>
<output>0.75</output>

<result>0.75</result>