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 59
38 ELEMENTS … ACB, and from the point A let AD be drawn (12. i.) perpendicularto BC produced: The square of AB is greater than the squares ofAC, CB, by twice the rectansjle BC.CD. Because the straia;ht line BD is divided into two parts in the pointC, BD = (4. 3.) BC« -f- CD» 4- A 2BC.CD; add x\D» to both: ThenBD…
Euclid's Elements · Geometry · Trigonometry
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