The Elements of Euclid: The Errors, by which Theon, Or Others, Have Long Ago 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 twelfthMathew Carey, and sold by J. Conrad & Company, S. F. Bradford, Birch & Small, and Samuel Etheridge. Printed by T. & G. Palmer, 116, High-Street., 1806 - Trigonometry - 518 pages |
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Page 24
... right angles , or are together equal to two right angles . For , if the angle CBA be equal to ABD each of them is a a Def.10 . right angle ; but if not , from the point B draw BE at right a A D B C D E B A C c 2. Ax . b 11. 1. angles to ...
... right angles , or are together equal to two right angles . For , if the angle CBA be equal to ABD each of them is a a Def.10 . right angle ; but if not , from the point B draw BE at right a A D B C D E B A C c 2. Ax . b 11. 1. angles to ...
Page 25
... angles with the straight line CBE , upon one side of it , the angles ABC , ABE are together equal a to two right a 13. 14 angles ; but the angles ABC , ABD are likewise together equal to two right angles ; therefore the angles CBA , ABE ...
... angles with the straight line CBE , upon one side of it , the angles ABC , ABE are together equal a to two right a 13. 14 angles ; but the angles ABC , ABD are likewise together equal to two right angles ; therefore the angles CBA , ABE ...
Page 26
... right angles . Produce BC to D ; and be- cause ACD is the exterior angle of the triangle ABC , ACD is a 16. 1. greater than the interior and oppósite angle ABC ; to each of A B C D these add the angle ACB ; therefore the angles ACD 26 THE ...
... right angles . Produce BC to D ; and be- cause ACD is the exterior angle of the triangle ABC , ACD is a 16. 1. greater than the interior and oppósite angle ABC ; to each of A B C D these add the angle ACB ; therefore the angles ACD 26 THE ...
Page 27
... angle ACB ; therefore the angles ACD , ACB are Book I. greater than the angles ABC , ACB ; but ACD , ACB are to- gether equal to two right angles ; therefore the angles ABC , b 13. 1 . BCA are less than two right angles . In like manner ...
... angle ACB ; therefore the angles ACD , ACB are Book I. greater than the angles ABC , ACB ; but ACD , ACB are to- gether equal to two right angles ; therefore the angles ABC , b 13. 1 . BCA are less than two right angles . In like manner ...
Page 34
... angle equal to the interior and opposite upon the same side of the line ; or makes the interior angles upon the same side together equal to two right angles ; the two straight lines shall be parallel to one another . Let the straight ...
... angle equal to the interior and opposite upon the same side of the line ; or makes the interior angles upon the same side together equal to two right angles ; the two straight lines shall be parallel to one another . Let the straight ...
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Common terms and phrases
altitude angle ABC angle BAC base BC BC is equal BC is given bisected Book XI centre circle ABCD circumference cone cylinder demonstrated described diameter draw drawn equal angles equiangular equimultiples Euclid excess fore given angle given in magnitude given in position given in species given magnitude given point given ratio given straight line gnomon greater join less Let ABC meet multiple opposite parallel parallelogram perpendicular point F polygon prisms proportionals proposition pyramid Q. E. D. PROP radius ratio of AE rectangle CB rectangle contained rectilineal figure right angles segment sides BA similar sine solid angle solid parallelepipeds square of AC straight line AB straight line BC tangent THEOR third triangle ABC triplicate ratio vertex wherefore
Popular passages
Page 30 - Any two sides of a triangle are together greater than the third side.
Page 64 - To divide a given straight line into two parts, so that the rectangle contained by the whole, and one of the parts, may be equal to the square of the other part.
Page 30 - IF, from the ends of the side of a triangle, there be drawn two straight lines to a point within the triangle, these shall be less than the other two sides of the triangle, but shall contain a greater angle. Let...
Page 59 - PROP. VIII. THEOR. IF a straight line be divided into any two parts, tour 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.
Page 28 - If one side of a triangle be produced, the exterior angle is greater than either of the interior opposite angles.
Page 165 - 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.
Page 19 - THE angles at the base of an isosceles triangle are equal to one another : and, if the equal sides be produced, the angles upon the other side of the base shall be equal.
Page 191 - In right angled triangles, the rectilineal figure described upon the side opposite to the right angle, is equal to the similar, and similarly described figures upon the sides containing the right angle.
Page 39 - All the interior angles of any rectilineal figure, together with four right angles, are equal to twice as many right angles as the figure has sidef. For any rectilineal figure ABCDE can be divided into as many triangles as the figure has sides, by drawing straight lines from a point F within the figure to each of its angles.
Page 180 - Therefore, universally, similar rectilineal figures are to one another in the duplicate ratio of their homologous sides.