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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ABC is equal ABCD Algebra alternate angle ABC angle BAC angles equal applied base base BC bisected centre circle ABC circumference coincide common consequent contained demonstrated described diameter divided double draw equal equal angles equiangular equilateral equimultiples Euclid exceed extremes fall figure fore fourth Geometry given circle given right line greater greater ratio half hence inscribed join less Let ABC magnitudes manner meet multiple parallel parallelogram pass perpendicular placed PROBLEM produced proportional PROPOSITION ratio reason rectangle rectangle contained rectilineal figure remaining angle right angles right line ac segment shown sides square square of ac taken THEOREM third triangle ABC unequal whence Wherefore whole
Side xxx - 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.
Side 33 - The complements of the parallelograms, which are about the diameter of any parallelogram, are equal to one another.
Side 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.
Side 27 - 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.
Side xxxii - 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.
Side 28 - Parallelograms upon the same base, and between the same parallels, are equal to one another.
Side 73 - 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.
Side 88 - From a given circle to cut off a segment, which shall contain an angle equal to a given rectilineal angle.
Side 95 - 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.