I run around a circular living quarter and just run 314 meters. Find the area of the circular quarter?
我绕一个圆形生活小区跑一圈刚好跑314米，求圆形小区的面积？
<gadget id="calculator">314 / 3.14 / 2</gadget>
<output>50</output>

<gadget id="calculator">50 ** 2</gadget>
<output>2_500</output>

<gadget id="calculator">3.14 * 2_500</gadget>
<output>7_850</output>

<result>7_850</result>