The roller of a road roller is 1.5 meters long and the diameter of the bottom surface is 10 decimeters. If the roller rolls forward for 100 revolutions, how many square meters will the road surface be rolled over?
一台压路机的滚筒长1.5米，底面直径是10分米，这台压路机向前滚动100周，压过的路面面积是多少平方米？
<gadget id="calculator">10 / 10</gadget>
<output>1</output>

<gadget id="calculator">3.14 * 1 * 100 * 1.5</gadget>
<output>471</output>

<result>471</result>