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 26
bisects the base, and is also perpendicular to it. 14 EUCLIDS ELEMENTS. Proposition 5. Theorem. The angles at the base of an isosceles triangle are equal to oneanother) and if the equal sides be produced, the angles on the otherside of the base shall also be equal to one another. Let ABC be an… … Construction. In BD take any point F,and from AE the greater cut off AG equal to AF the less. [1.3.Join EC and GB. Proof. (1) In the two triangles AFC, AGB, (AF is equal to AG, [Construction, and AC is equal to AB^ [Hypothesis, and the contained angle FAG is common to both;therefore the triangles…
Euclid's Elements · Geometry · Mathematics, Greek
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