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 88
e straight line DB ; but FE isequal toFB, wherefore DE, EF are equal toDB, BF; and the ►lase FD is common to thetwo tria gles DEF DBF ; thereiore the an-gle DEF is equal (8. I.) to the angle DBF?and DEF is a right angle, therefore also DBFis a right angle: but FB, if produced, is adiameter, and the… … ELEBXENTS OF GEOMETRY. VWW%iWW%/^VWVWVVX/VWVVVVVX» BOOK IV. DEFINITIONS. 4 Rectilineal figure is said to be inscribefl in another rectilinealj^ figure, when all the angles of the inscribedfigure are U|)on the sides of the figure in whichit is inscribed, each upon each. II.
Euclid's Elements · Geometry · Trigonometry
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