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 87
gle; therefore AD.D-f-£^=£0*. Now, because EBD is a rightangle, ED«=EBHBD^=EC^+BDS andtherefore, AD.DC+EC=»=BC2+BDS andAD.DC=BD^ Wherefore, if from any point, &c. Q. E.D. CoR. If from any point without a circle,there be drawn two straight lines cutting it,as AB, AC, the rectangles contained by…
Euclid's Elements · Geometry · Trigonometry
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