There is a circular lawn with a circumference of 94.2m, and an automatic rotary sprinkler irrigation device is to be installed on this lawn. What is the appropriate range and installation position of the following sprinkler irrigation devices?
有一块周长为94.2m的圆形草坪，现要在这块草坪上安装一个自动旋转喷灌装置．下列喷灌装置的射程及安装位置合适的是多少m圆心处
<gadget id="calculator">94.2 / 3.14 / 2</gadget>
<output>15</output>

<result>15</result>