A roller has a diameter of 0.5 meters and a length of 1.2 meters. If it rolls on the road for 20 weeks, how many square meters is the area over the road?
一台压路机的滚筒直径是0.5米，长1.2米．如果它在公路上滚动20周，压过路面面积是多少平方米？
<gadget id="calculator">3.14 * 0.5 * 20 * 1.2</gadget>
<output>37.68</output>

<result>37.68</result>