Non-Euclidean geometry; a critical and historical study of its development (1912)
Bonola, Roberto, 1874-1911, Carslaw, H. S. (Horatio Scott), 1870-1954 · LaSalle, Ill. : Open Court Publishing Co. · leaf 233
prism with n angles the sum is (2 n—4) rightangles. This proof is given in § 2 below. . ^ Cf. LoBATSCHEWSKY (Engels translation) p. 172. 2l8 Appendix III. The Non-Euclidean Parallel Construction. Finally, the correspondence stated in the above theorem—only part of which is required for the Parallel… … Fig. 78. Let ABCD be a plane quadrilateral in which the anglesat Z>, Ay B are right angles. Let the angle at C be denotedby p, AD by a, DC by /, CB by c, and BA by m. At A draw the perpendicular ^Q to the plane of thequadrilateral. Through B, C, and Z? draw ^Q, CQ and Z>S2parallel to A^. Also…
Geometry, Non-Euclidean
Internet Archive · California Digital Library · Public Domain Mark 1.0. Free to use for anything.
