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 69
A Therefore DG 68 ELEMENTS … PROP. IX. THEOR. If a point be taken within a circle, from which therefall more than two equal straight lines upon the circum-ference, that point is the centre of the circle. Let the point D be taken within the circle ABC, from which therefall on the circumference more than two equal straight…
Euclid's Elements · Geometry · Trigonometry
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