A wire can enclose a circle with a radius of 3 cm. If it encloses an equilateral triangle, what is the length of each side?
一根铁丝可以围成一个半径是3cm圆，如果用它围成一个等边三角形，那么每边的长是多少厘米？
<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>