A piece of iron wire can exactly form a square with a side length of 9.42 decimeters. If a circle is formed with this iron wire, what is the area of the circle in square decimeters? (no iron wire left)
一根铁丝恰好可以围成一个边长是9.42分米的正方形，如果用这根铁丝围成一个圆，这个圆的面积是多少平方分米？(铁丝均无剩余)
<gadget id="calculator">9.42 * 4</gadget>
<output>37.68</output>

<gadget id="calculator">37.68 / 3.14 / 2</gadget>
<output>6</output>

<gadget id="calculator">3.14 * 6 * 6</gadget>
<output>113.04</output>

<result>113.04</result>