A cuboid of wood is 2.8 meters long and has a square cross section. After sawing it into 3 sections, the surface area increases by 144 square centimeters. What is the surface area of this piece of wood?
一根长方体木料，长2.8米，横截面是正方形，将它锯成3段以后，表面积增加了144平方厘米．原来这根木料的表面积是多少？
<gadget id="calculator">6 * 6</gadget>
<output>36</output>

<gadget id="calculator">6 * 2.8 * 100</gadget>
<output>1_680</output>

<gadget id="calculator">36 + 1_680 + 1_680</gadget>
<output>3_396</output>

<gadget id="calculator">3_396 * 2</gadget>
<output>6_792</output>

<result>6_792</result>