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 |
From inside the book
Results 1-5 of 100
Page 20
... PROP . XX . THEOR . ANY two fides of a triangle are together greater than the 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 ...
... PROP . XX . THEOR . ANY two fides of a triangle are together greater than the 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 ...
Page 22
... PROP . XXIII . PRO B. AT a given point in a given straight line to make a rectilineal angle equal to a given rectilineal angle . Let AB be the given straight line , and A the given point in it , and DCE the given rectilineal angle ; it ...
... PROP . XXIII . PRO B. AT a given point in a given straight line to make a rectilineal angle equal to a given rectilineal angle . Let AB be the given straight line , and A the given point in it , and DCE the given rectilineal angle ; it ...
Page 32
... PROP . XXXV . THEOR . PARALLELOGRAMS upon the same base and between the fame parallels , are equal to one another . Let the parallelograms ABCD , EBCF be upon the fame base BC and between the fame parallels AF , BC . the parallelogiam ...
... PROP . XXXV . THEOR . PARALLELOGRAMS upon the same base and between the fame parallels , are equal to one another . Let the parallelograms ABCD , EBCF be upon the fame base BC and between the fame parallels AF , BC . the parallelogiam ...
Page 37
... PROP . XLIII . THEOR . HE complements of the parallelograms which are about the diameter of any parallelogram , are equal to one another . Let ABCD be a parallelogram , of which the diameter is AC , and EH , FG the parallelograms A H D ...
... PROP . XLIII . THEOR . HE complements of the parallelograms which are about the diameter of any parallelogram , are equal to one another . Let ABCD be a parallelogram , of which the diameter is AC , and EH , FG the parallelograms A H D ...
Page 68
... PROP . IX . THEOR . F a point be taken within a circle , from which there fall more than two equal ftraight lines to the cir- cumference , that point is the center of the circle . Let the point D be taken within the circle ABC , from ...
... PROP . IX . THEOR . F a point be taken within a circle , from which there fall more than two equal ftraight lines to the cir- cumference , that point is the center of the circle . Let the point D be taken within the circle ABC , from ...
Other editions - View all
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...