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 196
ve that AD.^^BDj,BD3-:CD., and CD^ = AT>.^, 20. The triangle formed by joining the centres of the escribed circlesof the triangle and that formed by joining the points of contact of theinscribed circle are equiangular. 21. How many circles can, in general, be drawn to touch threestraight lines ?… … Construction. Bisect AB, AC at the points F, E; [1.10.from these points draw FO, EO at right angles to AB, AC; [L ILFO, EO, produced, will meet one another; for if they do not meet they are parallel;therefore AB, AC, which are at right angles to them, areparallel, which is absurd : let them meet at…
Euclid's Elements · Geometry · Mathematics, Greek
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