A cylindrical bucket has a bottom radius of 2dm and a height of 0.5m. How many liters of water can this bucket hold?
一个圆柱形水桶，底面半径是2dm，高0.5m，这个水桶最多能装水多少升？
<gadget id="calculator">2 ** 2</gadget>
<output>4</output>

<gadget id="calculator">0.5 * 10</gadget>
<output>5</output>

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

<result>62.8</result>