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 2
... perpendicular to it . XI . An obtufe angle is that which is greater than a right angle . XII . An acute angle is that which is lefs than a right angle . XIII . " A term or boundary , is the extremity of any thing . " XIV . A figure is ...
... perpendicular to it . XI . An obtufe angle is that which is greater than a right angle . XII . An acute angle is that which is lefs than a right angle . XIII . " A term or boundary , is the extremity of any thing . " XIV . A figure is ...
Page 15
... perpendicular to a given straight line of an unlimited length , from a given point without it . Let AB be the given straight line , which may be produced to any length both ways , and let C be a point without it . It is required to draw ...
... perpendicular to a given straight line of an unlimited length , from a given point without it . Let AB be the given straight line , which may be produced to any length both ways , and let C be a point without it . It is required to draw ...
Page 55
... perpendicular falls , and the straight line intercept- ed without the triangle between the perpendicular and the obtufe angle . Book II . Let ABC be an obtufe angled triangle , having the obtufe angle ACB , and from the point A let AD ...
... perpendicular falls , and the straight line intercept- ed without the triangle between the perpendicular and the obtufe angle . Book II . Let ABC be an obtufe angled triangle , having the obtufe angle ACB , and from the point A let AD ...
Page 56
... perpendicular let fall upon it from the oppofite angle , and the acute angle . Let ABC be any triangle , and the angle at B one of its acute angles , and upon BC one of the fides containing it let fall the perpendicular AD from the ...
... perpendicular let fall upon it from the oppofite angle , and the acute angle . Let ABC be any triangle , and the angle at B one of its acute angles , and upon BC one of the fides containing it let fall the perpendicular AD from the ...
Page 57
... perpendicular to BC ; then is BC the ftraight line between the perpendicular and the acute angle at B. and it C is manifeft that the fquares of AB , BC are e- qual to the square of AC , and twice the square of BC . Therefore in every ...
... perpendicular to BC ; then is BC the ftraight line between the perpendicular and the acute angle at B. and it C is manifeft that the fquares of AB , BC are e- qual to the square of AC , and twice the square of BC . Therefore in every ...
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...