A wire can enclose a circle with a radius of 3 cm. If it is used to enclose an equilateral triangle, what is the side length of this triangle?
一根铁丝可以围成一个半径是3厘米的圆，如果用它围成一个等边三角形，这个三角形的边长是多少厘米．
<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>