The school playground is 80 meters long and covers an area of 5200 square meters. The "Six Day" Children's Day celebration requires a square field as large as possible as the activity area, and hangs ribbons around the activity area. How many meters of ribbons do you need to prepare?
学校操场长80米，面积5200平方米．"六一"儿童节庆祝活动需要尽可能大的一块正方形场地作为活动区域，并在这块活动区域四周挂上彩带，需要准备彩带多少米？
<gadget id="calculator">5_200 / 80</gadget>
<output>65</output>

<gadget id="calculator">65 * 4</gadget>
<output>260</output>

<result>260</result>