A wire is 314 centimeters long, and it forms a circle, what is the area of the circle in square centimeters?
一根铁丝长314厘米，把它围成一个圆，圆的面积是多少平方厘米？
<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>