A wire 62.8 meters long forms a circle, what is the area of the circle in square meters?
一根长62.8米的铁丝围成一个圆形，这个圆形的面积是多少平方米．
<gadget id="calculator">62.8 / 3.14 / 2</gadget>
<output>10</output>

<gadget id="calculator">10 ** 2</gadget>
<output>100</output>

<gadget id="calculator">3.14 * 100</gadget>
<output>314</output>

<result>314</result>