There is an automatic rotary sprinkler on the grass in the park with a range of 8 meters. How many square meters of grass can it spray to?
公园草地上有一个自动旋转洒水器，射程是8米．它能喷洒到的草地面积是多少平方米？
<gadget id="calculator">8 ** 2</gadget>
<output>64</output>

<gadget id="calculator">3.14 * 64</gadget>
<output>200.96</output>

<result>200.96</result>