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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 93
, and joinAB BC, CD, D A; because BE is equal to ED, E being the centre,and because EA is at right angles to RD,ami common to the triani^les ABE, ADE;the base BA is equal (4. I.) to the baseAD; and, for the same reason, BC, CDare each of them equal to BA or AD; u|therefore the quadrilateral figure… … ©F GEOMETRY. B@OK IV. 9^ of the atij^les ABC, BCD, CD A is a right angle; therefore the quad=rilateral figure ABCD is rectangular, and it has been shown to beequilateral; therefore it is a square; and it isinseribed in the eiraleABCD. Which was to be done. PROP. VII. PROB. To describe a square… Euclid's Elements · Geometry · Trigonometry
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