A cylindrical bucket without a lid has a bottom diameter of 40 cm and a height of 50 cm. What is the volume of this bucket in milliliters?
一个圆柱形无盖水桶，底面直径40cm，高50cm，这个水桶的容积是多少毫升？
<gadget id="calculator">40 / 2</gadget>
<output>20</output>

<gadget id="calculator">20 ** 2</gadget>
<output>400</output>

<gadget id="calculator">3.14 * 400 * 50</gadget>
<output>62_800</output>

<result>62_800</result>