Find the surface area of each of the following cuboids: 6 meters long, 3 meters wide, and 2 meters high.
求下面各长方体的表面积：长6米，宽3米，高2米．
<gadget id="calculator">6 * 3</gadget>
<output>18</output>

<gadget id="calculator">6 * 2</gadget>
<output>12</output>

<gadget id="calculator">3 * 2</gadget>
<output>6</output>

<gadget id="calculator">18 + 12 + 6</gadget>
<output>36</output>

<gadget id="calculator">36 * 2</gadget>
<output>72</output>

<result>72</result>