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 twelfth |
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Page 8
... third fides , equal ; and the two triangles fhall be equal ; and their other angles fhall be equal , each to each , viz . thofe to which the equal fides are oppofite . Let ABC , DEF be two triangles which have the two fides AB , AC ...
... third fides , equal ; and the two triangles fhall be equal ; and their other angles fhall be equal , each to each , viz . thofe to which the equal fides are oppofite . Let ABC , DEF be two triangles which have the two fides AB , AC ...
Page 20
... third fide . Let ABC be a triangle ; any two fides of it together are great- er than the third fide , viz . the fides BA , AC greater than the fide BC ; and AB , BC greater than AC ; and BC , CA greater than AB . Produce BA to the point ...
... third fide . Let ABC be a triangle ; any two fides of it together are great- er than the third fide , viz . the fides BA , AC greater than the fide BC ; and AB , BC greater than AC ; and BC , CA greater than AB . Produce BA to the point ...
Page 21
... third " . Let A , B , C be the three given straight lines , of which any two whatever are greater than the third , viz . A and B greater than C ; A and C greater than B ; and B and C than A. It is required to make a triangle of which ...
... third " . Let A , B , C be the three given straight lines , of which any two whatever are greater than the third , viz . A and B greater than C ; A and C greater than B ; and B and C than A. It is required to make a triangle of which ...
Page 24
... third angle of the other . Let ABC , DEF be two triangles which have the angles ABC , BCA equal to the angles DEF ... third angle BAC to the third angle EDF . For if AB be not equal to DE , one of them must be the greater . Let AB be the ...
... third angle of the other . Let ABC , DEF be two triangles which have the angles ABC , BCA equal to the angles DEF ... third angle BAC to the third angle EDF . For if AB be not equal to DE , one of them must be the greater . Let AB be the ...
Page 25
... third angle BAC to the third angle EDF . Next , let the fides . which are oppofite to equal angles in each A triangle be equal to one another , viz . AB to DE ; likewife in this cafe , the other fides fhall be equal , AC to DF , and BC ...
... third angle BAC to the third angle EDF . Next , let the fides . which are oppofite to equal angles in each A triangle be equal to one another , viz . AB to DE ; likewife in this cafe , the other fides fhall be equal , AC to DF , and BC ...
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Common terms and phrases
AC is equal alfo alſo angle ABC angle BAC bafe baſe BC is given becauſe the angle bifected Book XI cafe circle ABCD circumference cone confequently cylinder defcribed demonftrated diameter drawn EFGH equal angles equiangular equimultiples Euclid excefs faid fame manner fame multiple fame ratio fecond fegment fhall fhewn fide BC fides fimilar fince firft firſt folid angle fome fore fquare of AC ftraight line AB given angle given ftraight line given in fpecies given in magnitude given in pofition given magnitude given ratio gnomon greater join lefs leſs likewife line BC muſt oppofite parallel parallelepipeds parallelogram perpendicular prifm Propofition proportionals pyramid rectangle contained rectilineal figure right angles ſhall ſphere ſquare thefe THEOR theſe thro tiple triangle ABC vertex wherefore
Popular passages
Page 156 - 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 3 - A circle is a plane figure contained by one line, which is called the circumference, and is such that all straight lines drawn from a certain point within the figure to the circumference, are equal to one another.
Page 323 - Equiangular parallelograms have to one another the ratio which is compounded of the ratios of their sides.
Page 92 - If from a point without a circle there be drawn two straight lines, one of which cuts the circle, and the other meets it ; if the rectangle contained by the whole line which cuts the circle, and the part of it without the circle, be equal to the square- of the line which meets it, the line which meets shall touch the circle.
Page 80 - EA : and because AD is equal to DC, and DE common to the triangles ADE, CDE, the two sides AD, DE are equal to the two CD, DE, each to each ; and the angle ADE is equal to the angle CDE, for each of them is a right angle ; therefore the base AE is equal (4.
Page 52 - If a straight line be bisected, and produced to any point, the square of the whole line thus produced, and the square of the part of it produced, are together double of the square of half the line bisected, and of the square of the line made up of the half and the part produced.
Page 36 - To a given straight line to apply a parallelogram, which shall be equal to a given triangle, and have one of its angles equal to a given rectilineal angle.
Page 2 - When a straight line standing on another straight line makes the adjacent angles equal to one another, each of the angles is called a right angle; and the straight line which stands on the other is called a perpendicular to it.
Page 54 - AB be the given straight line ; it is required to divide it into two parts, so that the rectangle contained by the whole, and one of the parts, shall be equal to the square of the other part.
Page 74 - The straight line drawn at right angles to the diameter of a circle, from the extremity of it, falls without the circle...