Problem 12 In the figure is shown a rectangular parallelepiped whose dimensions are 2, 4, 6. Points A, B, C, E, F, and L are each at the midpoint of an edge. Find the area of each of the sections ABEF, ABC, and MNL.
Solution 12
Square
Perimeter, $P = 4a$
Diagonal, $d = a\sqrt{2}$
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