A wire surrounds a square with a side length of 6 cm, and there are 6 cm left, what is the length of the wire in cm?
一根铁丝围成一个边长为6厘米的正方形，还剩6厘米，这个铁丝长多少厘米．
<gadget id="calculator">6 * 4</gadget>
<output>24</output>

<gadget id="calculator">24 + 6</gadget>
<output>30</output>

<result>30</result>