The first six books of the elements of Euclid : with a commentary and geometrical exercises ; to which are annexed a treatise on solid geometry, and short essays on ancient geometrical analysis, and the theory of transversals (1861)
Lardner, Dionysius, 1793-1859 · London : Print. for Taylor and Walton · leaf 279
260 ELEMENTS OF SOLID GEOMETRY. Proposition XXL ^125) The volume, a triangular pyramid, is one thirdof that of a prism having an equal base andaltitude. Let A B C be the base of the pyramid and c its vertex. ThroughB and A draw B b and A a parallel to C c andequal to it, and draw the lines a b c.…
Geometry
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