The sum of the sides of a cube is 54 cm, what is its surface area in square centimeters?
一个正方体的棱长总和是54厘米，它的表面积是多少平方厘米？
<gadget id="calculator">54 / 12</gadget>
<output>9/2 = around 4.5</output>

<gadget id="calculator">(9/2) * (9/2) * 6</gadget>
<output>243/2 = around 121.5</output>

<result>243/2 = around 121.5</result>