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The left and right sides make up the parallel sides of the trapezoid. The top and bottom would be congruent but not parallel.
2(x + delta x) = 2x + 2 delta x
so on top you have 2x + 2 delta x - 2x
which is 2 delta x
the delta x cancels out and you are left with just 2
so the limit is 2
12 x 12 x 24 = 3456
so the volume is 3456 in³