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 38
F, ECF is a right angle. Wherefore, from the given point C in the given straight lineAB, CF has been drawn at right angles to AB. [q.-e.f. 26 EUCLIDS ELEMENTS. Proposition 12. Problem. To draw a straight line perpendicular to a given straight line ofan unlimited length from a given point ivithout… … Construction. Take any point D on the side of AB, re-mote from C, and with centre C and radius CD describe thecircle EGF, meeting AB at F and G. [Postulated, Bisect FG- at H, [I. 10. and join CH.Then OH shall be the straight line required.Join OF, CG. Proof. In the triangles FHG, GHO, (FH is equal…
Euclid's Elements · Geometry · Mathematics, Greek
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