44 willow trees are planted around a square flower pond, and the distance between every two willow trees is 20 meters. What is the perimeter of this square in meters?
在一正方形花池的四周栽了44棵柳树，每两棵柳树之间的间隔是20米，这个正方形的周长是多少米？
<gadget id="calculator">44 * 20</gadget>
<output>880</output>

<result>880</result>