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 145
A B intersecting them perpendicularly, and bisect it atC, and through C draw D E parallel tothe given lines. This will be the locus ofthe centres. For if any other perpendi-cular F G be drawn, a circle described onit as the diameter will touch the givenlines. 2°. If the given lines intersect. Draw… … Proposition V. Problem. (424) About a given triangle (B A C) to circumscribea circle.
Geometry
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