There is a circular lawn with a circumference of 62.8 meters. It is planned to install an automatic rotating sprinkler for sprinkling irrigation. There are three types of devices with a range of 20 meters, 15 meters and 10 meters. Which range of device do you think should be selected is more suitable? Where is the best place to install it?
有一个周长62.8米的圆形草坪，准备为它安装自动旋转喷水龙头进行喷灌，现有射程为20米、15米、10米的三种装置．你认为应选哪种射程的装置比较合适？应安装在什么地方最好？
<gadget id="calculator">62.8 / 3.14 / 2</gadget>
<output>10</output>

<result>10</result>