The side length of a square swimming pool is 5 meters. Xiaohong walks around it. How many meters does Xiaohong walk?
一个正方形游泳池的边长是5米，小红绕着它走一圈，小红走了多少米？
<gadget id="calculator">5 * 4</gadget>
<output>20</output>

<result>20</result>