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 330
ms will be seen in my treatise on AlgebraicGeometry. The solutions there given are, however, by the Algebraical Analysis. ■f From 7ropi.£<y, I establish; or, according to some, from nopog, a transition. | Pappus defines a porism to be something between a theorem and problem, orthat in which… … (26) To draw a line passing through a given point, and crossing a given triangle, in such a manner that the sum of the perpendiculars on it from the two vertices on one side of it shall be equal to the perpendicular on it from the other vertex placed on the other side of it. Let D be the given…
Geometry
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