If the perimeter of a cube is 12 cm, what is its volume?
一个正方体的底面周长是12厘米，它的体积是多少．
<gadget id="calculator">12 / 4</gadget>
<output>3</output>

<gadget id="calculator">3 * 3 * 3</gadget>
<output>27</output>

<result>27</result>