The government of Sha Town plans to install sprinkler irrigation in the central lawn of the garden community. The maximum range of the automatic rotary sprinkler is 5 meters. What is the maximum area that it can spray?
沙镇政府计划在花园小区中心草坪内安装喷灌，自动旋转喷水器的最远射程是5米，它能喷灌的最大面积是多少？
<gadget id="calculator">5 ** 2</gadget>
<output>25</output>

<gadget id="calculator">3.14 * 25</gadget>
<output>78.5</output>

<result>78.5</result>