A road roller has a roller with a radius of 1 meter and a length of 2 meters. It rotates 10 times per minute, how many square meters per minute.
一辆压路机，滚筒半径为1米，长2米，每分钟转10下，每分钟转多少平方米．
<gadget id="calculator">3.14 * 1 * 2 * 10 * 2</gadget>
<output>125.6</output>

<result>125.6</result>