If the sum of the sides of a cube is 7.2 cm, what is its surface area?
一个正方体的棱长和是7.2厘米，它的表面积是多少．
<gadget id="calculator">7.2 / 12</gadget>
<output>0.6</output>

<gadget id="calculator">0.6 * 0.6 * 6</gadget>
<output>2.16</output>

<result>2.16</result>