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" The pyramid may be conceived to be made up of an infinite number of planes parallel to ABC. "
Key to System of practical mathematics. 2 pt. No.xvii - Σελίδα 149
των Scottish school-book assoc - 1845
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...as their bafes, which fome eafily demonftrate by the method of indivifibles ; for fince any pyramid may be conceived to be made up of an infinite number of little folids, all of the fame altitude, having all their bafes fimilar and parallel to the bafe of...

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...These lines will intersect in a point G, which is the centre of gravity of the pyramid. The pyramid may be conceived to be made up of an infinite number of planes parallel to ABC. Let abc be such a plane. Then, since the parallel planes A_^ abc, ABC are intersected...

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