The elements of Euclid for the use of schools and colleges; comprising the first six books and portions of the eleventh and twelfth books; (1903)
Euclid, Todhunter, I. (Isaac), 1820-1884, ed. edt, Simson, Robert, 1687-1768, ed. edt · London; New York, Macmillan · leaf 310
lel to CF; [Axiom 1 and XI. 9. \\ AC is equal and parallel to DF. [I. 33. Also because AB, BC are equal to DE, EF, each to each,and the base AC = the base DF ; .-. the z.ABC = the aDEF. [I. 8. Wherefore, if two straight lines, etc, [q.e.d. 298 EUCLIDS ELEMENTS. Proposition 11. Problem, To draw a… … I Construction. Draw any straight line BC in the plane BH,and from A draw AD perpendicular to BC. [L 12. Then, if AD be also perpendicular to the plane BH, the thingrequired is done. But, if not, from D draw, in the plane BH,the straight line DE at right angles to BC, [I. 11. and from A draw AF…
Euclid's Elements · Geometry · Mathematics, Greek
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