The sum of the lengths of the sides of a cube is 36dm, what is its surface area in dm**2.
一个正方体的棱长之和是36dm，它的表面积是多少dm**2．
<gadget id="calculator">36 / 12</gadget>
<output>3</output>

<gadget id="calculator">3 * 3 * 6</gadget>
<output>54</output>

<result>54</result>