An equilateral triangle with a side length of 3.14 cm is surrounded by a piece of iron wire. If the wire is used to form a circle, what is the radius of the circle in centimeters?
用一根铁丝围成一个边长为3.14厘米的等边三角形，如果把这根铁丝围成一个圆，这个圆的半径是多少厘米．
<gadget id="calculator">3 / 3.14 / 2</gadget>
<output>0.477707</output>

<gadget id="calculator">3.14 * 0.477707</gadget>
<output>1.5</output>

<result>1.5</result>