The surface area of a cuboid is 90cm**2, and the upper and lower sides are squares. If it can be cut into two cubes with equal volume, how many square centimeters will the surface area increase?
一个长方体表面积为90cm**2，上、下两个面为正方形，如果正好可以截成两个体积相等的正方体，则表面积增加多少平方厘米．
<gadget id="calculator">4 * 2</gadget>
<output>8</output>

<gadget id="calculator">8 + 2</gadget>
<output>10</output>

<gadget id="calculator">90 / 10</gadget>
<output>9</output>

<gadget id="calculator">9 * 2</gadget>
<output>18</output>

<result>18</result>