A cylindrical castle has a base circumference of 125.6 meters and a height of 15 meters. What is the volume of the castle in cubic meters?
一个圆柱形城堡，底面周长是125.6米，高是15米，这个城堡的体积是多少立方米？
<gadget id="calculator">125.6 / 3.14 / 2</gadget>
<output>20</output>

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

<gadget id="calculator">3.14 * 400 * 15</gadget>
<output>18_840</output>

<result>18_840</result>