A cylindrical bucket has a bottom diameter of 4 decimeters and a height of 5 decimeters. How many liters of water can this big bucket hold?
一个圆柱形水桶，底面直径是4分米，高是5分米，这个大桶能装水多少升？
<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>