In the design drawing with a scale of 1:500, the diameter of the bottom surface of a large cylindrical pool is 4 cm. What is the actual floor area of the pool? If the pool is 4 meters deep, what is its maximum capacity?
在比例1：500的设计图中，一个圆柱形大型水池底面直径是4厘米，求水池的实际占地面积？如果水池深4米，它的最大容量是多少？
<gadget id="calculator">1 / 500</gadget>
<output>1/500 = around 0.002</output>

<gadget id="calculator">4 / (1/500) / 100 / 2</gadget>
<output>10</output>

<gadget id="calculator">10 ** 2</gadget>
<output>100</output>

<gadget id="calculator">3.14 * 100 * 4</gadget>
<output>1_256</output>

<result>1_256</result>