A square with a side length of 9.42 decimeters is surrounded by an iron wire. If it is changed into a circle, what is the radius of the circle in decimeters?
用一根铁丝围成一个边长为9.42分米的正方形，如果把它改为成一个圆，那么圆的半径是多少分米
<gadget id="calculator">4 / 3.14 / 2</gadget>
<output>0.636943</output>

<gadget id="calculator">9.42 * 0.636943</gadget>
<output>6.000003</output>

<result>6.000003</result>