The perimeter of an equilateral triangle is equal to the perimeter of a square with a side length of 6 cm. Find the perimeter of the equilateral triangle.
一个等边三角形的周长与一个边长6厘米的正方形周长相等，求等边三角形的周长．
<gadget id="calculator">6 * 4</gadget>
<output>24</output>

<result>24</result>