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 50
nd the sign—placed between them, signifies that the latter is to be taken away from the former. * The sign = signifies, that the things between which it is placed are equal to one another. II. In every parallelogram, any ofthe parallelograms about a di-ameter, together with the twocomplements, is… … so ELEMENTSPROP. I. THEOR.
Euclid's Elements · Geometry · Trigonometry
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