A cylinder of wood has a base radius of 20 decimeters and a height of 10 decimeters, what is the volume of the cylinder? (π takes 3.14)
一根圆柱形木料底面半径是20分米，高10分米，则圆柱的体积为多少．(π取3.14)
<gadget id="calculator">20 ** 2</gadget>
<output>400</output>

<gadget id="calculator">3.14 * 400 * 10</gadget>
<output>12_560</output>

<result>12_560</result>