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 144
cribed touching the given right lines asin the diagram. Thus if three right lines intersect so as to form a triangle, fourdifferent circles may be described each touching them all. By this case it appears that the bisector of any internal angle of atriangle, and those of the remaining external… … 126 ELEMENTS OF EUCLID. given right lines is indeterminate. We can however in this case deter-mine the locus of its centre. 1°. If the two right lines be parallel. Draw the line A B intersecting them perpendicularly, and bisect it atC, and through C draw D E parallel tothe given lines. This will be…
Geometry
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