An iron wire can enclose a circle with a radius of 6 decimeters. If the iron wire encloses an equilateral triangle, what is the length of one side of this equilateral triangle?
一根铁丝能围成半径是6分米的圆，如果把这根铁丝围成一个等边三角形，这个等边三角形的一条边长是多少分米．
<gadget id="calculator">2 * 3.14 * 6</gadget>
<output>37.68</output>

<gadget id="calculator">37.68 / 3</gadget>
<output>12.56</output>

<result>12.56</result>