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If h1 and h2 are the differences in level between ground and the formation levels, m is the slope of the sloping sides. D is the distance between the cross sections then, prismoidal correction for a level section is

D/2m(h1 - h2)
D/3m(h1 - h2)
D/6m(h1 - h2)2
D/6m(h1 - h2)3
D/6m(h1 + h2)2

Correct Answer: D/6m(h1 - h2)2

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