The area of a square is 9cm**2. If such a square is used to form a cube, what is the sum of the lengths of the sides of the cube in cm?
一个正方形的面积是9cm**2，用这样的正方形围成一个正方体，这个正方体的棱长和是多少cm．
<gadget id="calculator">12 * 3</gadget>
<output>36</output>

<result>36</result>