A rectangular flower bed is 21 meters long and 19 meters wide. Xiao Liang runs 12 laps around the flower bed every day, how many meters does Xiao Liang run every day?
一个长方形花坛，长21米，宽19米．小亮每天围着花坛跑12圈，小亮每天跑多少米？
<gadget id="calculator">21 + 19</gadget>
<output>40</output>

<gadget id="calculator">40 * 2 * 12</gadget>
<output>960</output>

<result>960</result>