The lengths of three edges measured from a vertex of a cuboid are 7 decimeters, 2 decimeters and 2 decimeters respectively. What is the sum of the areas of the same four faces of this cuboid in square decimeters?
从一个长方体的一个顶点量的三条棱长分别为7分米、2分米和2分米，这个长方体相同的4个面的面积和是多少平方分米．
<gadget id="calculator">7 * 2 * 4</gadget>
<output>56</output>

<result>56</result>