# Euclid's Elements of geometry, transl. To which are added, algebraic demonstrations to the second and fifth books; also deductions in the first six, eleventh and twelfth books, with notes, by G. Phillips. Part 1, containing book i-vi

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### Contenido

 Sección 1 6 Sección 2 15 Sección 3 18 Sección 4 22 Sección 5 24 Sección 6 33 Sección 7 34 Sección 8 45
 Sección 14 93 Sección 15 94 Sección 16 97 Sección 17 115 Sección 18 128 Sección 19 129 Sección 20 132 Sección 21 134

 Sección 9 63 Sección 10 74 Sección 11 84 Sección 12 91 Sección 13 92
 Sección 22 143 Sección 23 144 Sección 24 145 Sección 25 178

### Pasajes populares

Página xxviii - A diameter of a circle is a straight line drawn through the centre, and terminated both ways by the circumference. XVIII. A semicircle is the figure contained by a diameter and the part of the circumference cut off by the diameter. XIX. "A segment of a circle is the figure contained by a straight line, and the circumference it cuts off.
Página 72 - The straight line drawn at right angles to the diameter of a circle, from the extremity of it, falls without the circle...
Página 31 - The complements of the parallelograms, which are about the diameter of any parallelogram, are equal to one another.
Página 144 - If two triangles have one angle of the one equal to one angle of the other and the sides about these equal angles proportional, the triangles are similar.
Página 25 - And because the angle ABC is equal to the angle BCD, and the angle CBD to the angle ACB, therefore the whole angle ABD is equal to the whole angle ACD • (ax.
Página xxx - Things which are double of the same are equal to one another. 7. Things which are halves of the same are equal to one another.
Página 26 - Parallelograms upon the same base, and between the same parallels, are equal to one another.
Página 71 - DH ; (i. def. 15.) therefore DH is greater than DG, the less than the greater, which is impossible : therefore no straight line can be drawn from the point A, between AE and the circumference, which does not cut the circle : or, which amounts to the same thing, however great an acute angle a straight line makes with the diameter at the point A, or however small an angle it makes with AE, the circumference must pass between that straight line and the perpendicular AE.
Página 86 - From a given circle to cut off a segment, which shall contain an angle equal to a given rectilineal angle.
Página 93 - IN a given circle to inscribe a triangle equiangular to a given triangle. Let ABC be the given circle, and DEF the given triangle; it is required to inscribe in the circle ABC a triangle equiangular to the triangle DEF. Draw (1 7. 3.) the straight line G AH touching the circle in the point A, and. at the point A, in the straight line AH, make (23.