If a wire can enclose a circle with a radius of 3 decimeters, if this wire forms an equilateral triangle, what is the length of one side of this equilateral triangle?
一根铁丝能围成半径是3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 * 3</gadget>
<output>18.84</output>

<gadget id="calculator">18.84 / 3</gadget>
<output>6.28</output>

<result>6.28</result>