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 95
d from the centre G. at tl-.edistance of one of them, will pass throuc hthe extremities of the other three; andwill also touch the straight lines AB, RC,CD, DA, because the angU-s at the pointsE, F, H, K, are right (29. 1.) angles, andbecause the straight line which is drawnfrom the extremity of a… … PROP. IX. PROB. To describe a circle about a given square. Let ABCD be the given square; it is required to describe a circleabout it. Join AC, BD, cutting one another in E; and because DA is equalto AB, and AC common to the triangles DAC, BAC, the two sidesDA, AC are equal to the two BA, AC, and…
Euclid's Elements · Geometry · Trigonometry
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![An illustration from Nicolai Copernici Torinensis De reuolutionibus orbium coelestium, libri VI : Habes in hoc opere iam recens nato, & aedito, studiose lector, motus stellarum, tam fixarum, quàm erraticarum, cum ex ueteribus, tum etiam ex recentibus obseruationibus restitutos: & nouis insuper ac admirabilibus hypothesibus ornatos. Habes etiam tabulas expeditissimas, ex quibus eosdem ad quoduis tempus quàm facillime caculare poteris. Igitur eme, lege, fruere. [Line in Greek] (1543)](https://img.insideoutlibrary.com/img/200/ia-nicolaicopernici00cope-94-67.webp)