Elements of geometry : containing the first six books of Euclid, with a supplement on the quadrature of the circle, and the geometry of solids : to which are added, Elements of plane and spherical geometry (1826)
Playfair, John, 1748-1819, Euclid · Philadelphia : Marot & Walter · leaf 239
pole of any great circle to thecentre of the sphere is at right angles to the plane of that circle; and,conversely, a straight line drawn from the centre of the sphere per-pendicular to tbe plane of any great circle, meets the superficies ofthe sphere in (he pole of that circle. Cor. 2. The circle…
Euclid's Elements · Geometry · Trigonometry
Internet Archive · Public Domain Mark 1.0. Free to use for anything.
