A cylindrical piece of wood has a base radius of 10 decimeters and a height of 30 decimeters, what is the volume of the cylinder (take 3.14 for π)
一根圆柱形木料底面半径是10分米，高30分米，则圆柱的体积为多少(π取3.14)
<gadget id="calculator">10 ** 2</gadget>
<output>100</output>

<gadget id="calculator">3.14 * 100 * 30</gadget>
<output>9_420</output>

<result>9_420</result>