A piece of iron wire can form a square with a side length of 3.14 cm, and a circle can be surrounded by it. What is the radius of this circle in cm?
一根铁丝可以围成一个边长3.14厘米的正方形，用它围一个圆，这个圆的半径是多少厘米．
<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>