The roller of the road roller is a cylinder with a ground diameter of 2 meters and a length of 2.5 meters. Rolling 10 cycles per minute, how much area of road can be pressed in half an hour?
压路机的滚筒是一个圆柱体，它的地面直径是2米，长2.5米．每分钟滚动10周，半小时能压多大面积的路面？
<gadget id="calculator">3.14 * 2 * 2.5 * 10 * 30</gadget>
<output>4_710</output>

<result>4_710</result>