A cuboid has a square base, a height of 24 cm, and a square when its sides are expanded. Find the surface area of this cuboid.
一个长方体，底面是正方形，高是24厘米，侧面展开正好也是一个正方形，求这个长方体的表面积．
<gadget id="calculator">24 / 4</gadget>
<output>6</output>

<gadget id="calculator">6 * 6 * 2</gadget>
<output>72</output>

<gadget id="calculator">24 * 24</gadget>
<output>576</output>

<gadget id="calculator">72 + 576</gadget>
<output>648</output>

<result>648</result>