What is the area of a circle enclosed by wires 94.2 cm long?
用长94.2厘米铁丝围成的圆的面积是多少平方厘米．
<gadget id="calculator">94.2 / 3.14 / 2</gadget>
<output>15</output>

<gadget id="calculator">15 ** 2</gadget>
<output>225</output>

<gadget id="calculator">3.14 * 225</gadget>
<output>706.5</output>

<result>706.5</result>