Use a wire with a length of 94.2 decimeters to form the largest circle, what is the area of this circle in decimeters**2.
用一根长94.2分米的铁丝围成一个最大的圆，这个圆的面积是多少分米**2．
<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>