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
EABis the half of DAB, and EBA the half ofABC; the angle EAB is equal to the angleEBA: and the side EA (6. 1.) to the side EB. In the same manner,it may be demonstrated, that the straight lines EC, ED are each i,fthem equal toEA, or EB; therefore the four straight lines EA. EB,EC, ED are equal to… … OF GEOMETRY. BOOK IV. 95 PROP. X. PROB. To describe an isosceles triangle, having each of the an-gles at the base double of the third angle. Take any straight line AB, ani^i^ide (H. 2.) it in the point C,sothai the rectan2;le A3, liC may b^Pjual to the Sijjiare of AC ; aadfro n the centre A, at the…
Euclid's Elements · Geometry · Trigonometry
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