The Elements of Euclid: The Errors by which Theon, Or Others, Have Long Vitiated These Books, are Corrected, and Some of Euclid's Demonstrations are Restored. Also the Book of Euclid's Data, in Like Manner Corrected. viz. the first six books, together with the eleventh and twelfthJ. Collingwood, 1827 - 513 σελίδες |
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Σελίδα 7
... ABC shall be an equilateral triangle . Because the point A is the centre of the circle BCD , * * nition . 1st Ax- AC is equal to AB ; and because the point B is the 15 Defi centre of the circle ACE , BC is equal to BA : but it has been ...
... ABC shall be an equilateral triangle . Because the point A is the centre of the circle BCD , * * nition . 1st Ax- AC is equal to AB ; and because the point B is the 15 Defi centre of the circle ACE , BC is equal to BA : but it has been ...
Σελίδα 9
... triangle ABC be applied to DEF , so that the point A may be on D , and the straight line AB upon DE ; the point B ... triangle ABC coincides with the whole triangle DEF , and is equal to it ; and the other angles of the one coincide with ...
... triangle ABC be applied to DEF , so that the point A may be on D , and the straight line AB upon DE ; the point B ... triangle ABC coincides with the whole triangle DEF , and is equal to it ; and the other angles of the one coincide with ...
Σελίδα 10
... triangle AFC to the triangle AGB ; and the remaining angles of the one are equal to the remaining angles of the ... ABC is equal † to the remaining angle ACB , which are the angles at the base of the triangle ABC : and it has also been ...
... triangle AFC to the triangle AGB ; and the remaining angles of the one are equal to the remaining angles of the ... ABC is equal † to the remaining angle ACB , which are the angles at the base of the triangle ABC : and it has also been ...
Σελίδα 12
... ABC , DEF be two triangles , having the two sides AB , AC , equal to the two sides DE , DF , each to each , viz . AB ... triangle ABC be applied to DEF , so that the point B may be on E , and the straight line BC upon A B DG CE EF ; the ...
... ABC , DEF be two triangles , having the two sides AB , AC , equal to the two sides DE , DF , each to each , viz . AB ... triangle ABC be applied to DEF , so that the point B may be on E , and the straight line BC upon A B DG CE EF ; the ...
Σελίδα 13
... triangle ABC , and bisect the angle ACB by the straight line CD . shall be cut into two equal parts in the point D. Because AC is equal to CB , and CD common to the two triangles ACD , BCD , the two sides AC , CD , are equal to BC , CD ...
... triangle ABC , and bisect the angle ACB by the straight line CD . shall be cut into two equal parts in the point D. Because AC is equal to CB , and CD common to the two triangles ACD , BCD , the two sides AC , CD , are equal to BC , CD ...
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ABC is given AC is equal altitude angle ABC angle BAC base BC bisected centre circle ABCD circumference common logarithm cone Constr cylinder demonstrated described diameter draw drawn equal angles equiangular equimultiples Euclid ex æquali excess fore given angle given in magnitude given in position given in species given magnitude given ratio given straight line gnomon greater join less Let ABC logarithm multiple parallel parallelogram AC perpendicular point F polygon prism proportionals proposition pyramid Q. E. D. PROP radius ratio of AE rectangle contained rectilineal figure right angles ROBERT SIMSON segment shewn sides BA similar sine solid angle solid parallelopiped square of AC straight line AB straight line BC tangent THEOR triangle ABC vertex wherefore
Δημοφιλή αποσπάσματα
Σελίδα 141 - 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.
Σελίδα 40 - If there be two straight lines, one of which is divided into any number of parts, the rectangle contained by the two straight lines is equal to the rectangles contained by the undivided line, and the several parts of the divided line. Let...
Σελίδα 26 - If a straight line fall upon two parallel straight lines, it makes the alternate angles equal to one another, and the exterior angle equal to the interior and opposite upon the same side, and also the two interior angles upon the same side together equal to two right angles.
Σελίδα 46 - If a straight line be divided into any two parts, four times the rectangle contained by the whole line and one of the parts, together with the square of the other part, is equal to the square of the straight line which is made up of the whole and that part.
Σελίδα 28 - Cor. angles; that is * together with four right angles. There1s, 1. fore all the angles of the figure, together with four right angles, are equal to twice as many right angles as the figure has sides.
Σελίδα 21 - If two triangles have two sides of the one equal to two sides of the other, each to each, but the angle contained by the two sides of one of them greater than the angle contained by the two sides equal to them, of the other ; the base of that which has the greater angle shall be greater than the base of the other.
Σελίδα 12 - IF two triangles have two sides of the one equal to two sides of the other, each to each, and have likewise their bases equal; the angle. which is contained by the two sides...
Σελίδα 169 - Wherefore, in equal circles &c. QED PROPOSITION B. THEOREM If the vertical angle of a triangle be bisected by a straight line which likewise cuts the base, the rectangle contained by the sides of the triangle is equal to the rectangle contained by the segments of the base, together with the square on the straight line which bisects the angle.
Σελίδα 5 - LET it be granted that a straight line may be drawn from any one point to any other point. 2. That a terminated straight line may be produced to any length in a straight line. 3. And that a circle may be described from any centre, at any distance from that centre.
Σελίδα 97 - If two triangles have two angles of the one equal to two angles of the other, each to each, and one side equal to one side, viz.