A piece of iron wire with a length of 210 cm is used to form an equilateral triangle. What is the side length of this equilateral triangle in cm?
用一根长210cm的铁丝刚好围成一个等边三角形，这个等边三角形的边长是多少cm．
<gadget id="calculator">210 / 3</gadget>
<output>70</output>

<result>70</result>