The gymnasium has a square football field with a side length of 7 meters. Lulu ran 4 laps along the football field. How many meters did he run in total?
体育馆有一块正方形的足球场，边长为7米，露露沿着足球场跑了4圈．他一共跑了多少米？
<gadget id="calculator">7 * 4 * 4</gadget>
<output>112</output>

<result>112</result>