A square with a side length of 3.14 decimeters is surrounded by an iron wire. If this iron wire is used to form a circle, what is the radius of this circle in decimeters?
用一根铁丝围成一个边长是3.14分米的正方形，如果用这根铁丝围成一个圆，这个圆的半径是多少分米？
<gadget id="calculator">4 / 3.14 / 2</gadget>
<output>0.636943</output>

<gadget id="calculator">3.14 * 0.636943</gadget>
<output>2.000001</output>

<result>2.000001</result>