What is the area of a circle surrounded by wires 62.8 cm long?
用长62.8厘米的铁丝围成的圆的面积是多少平方厘米．
<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>