The Elements of Euclid: With Dissertations Intended to Assist and Encourage a Critical Examination of These Elements as the Most Effectual Means of Establishing a Juster Taste Upon Mathematical Subjects Than that which at Present Prevails |
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Page 67
... - nishes a remarkable inftance of this ; he fhews how to turn a four- fided figure into a parallelogram & c . and as no new circumstance i 2 would would occur , whatever be the number of fides of DISSERTATION III . 67.
... - nishes a remarkable inftance of this ; he fhews how to turn a four- fided figure into a parallelogram & c . and as no new circumstance i 2 would would occur , whatever be the number of fides of DISSERTATION III . 67.
Page 68
... parallelogram ; never confidering that Euclid has turned any rectilineal figure into a parallelogram , whatever be the number of its fides ; and whatever be their position to one another . Now I hope it is evident that Euclid had some ...
... parallelogram ; never confidering that Euclid has turned any rectilineal figure into a parallelogram , whatever be the number of its fides ; and whatever be their position to one another . Now I hope it is evident that Euclid had some ...
Page 73
... parallelogram having a given angle it will be found that almost every propofition which goes before , is neceffary towards a proper folution of this problem , and if the student would be at the pains to examine how far this is true in ...
... parallelogram having a given angle it will be found that almost every propofition which goes before , is neceffary towards a proper folution of this problem , and if the student would be at the pains to examine how far this is true in ...
Page 74
... parallelograms , by which a foundation is laid for turning all rectilineal figures , however irregular into parallelograms . And laftly when the usefulness of the triangle is confidered , the reader will not be furprized to find fo much ...
... parallelograms , by which a foundation is laid for turning all rectilineal figures , however irregular into parallelograms . And laftly when the usefulness of the triangle is confidered , the reader will not be furprized to find fo much ...
Page 76
... parallelogram ; this follows directly from this confi- deration ; the oppofite angles being equal to one another , and the four angles equal to four right angles , any two of them taken in order round the figure will be the half of the ...
... parallelogram ; this follows directly from this confi- deration ; the oppofite angles being equal to one another , and the four angles equal to four right angles , any two of them taken in order round the figure will be the half of the ...
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The Elements of Euclid: With Dissertations Intended to Assist and Encourage ... James Williamson,James Euclid No preview available - 2016 |
Common terms and phrases
ABCD alfo alſo angle ABC angle BAC angle contained angle equal apply itſelf bafe baſe BC is equal Book certainly circle ABC circumference common notion confequences conft conftruction cut in halves demonftrated deſcribed diſtance drawn equal angles equiangular equilateral equimultiples Euclid exceed faid fame manner fame multiple fame parallels fame ratio fame reaſon fecond fegment fhall fides fimilar fince firſt fome fquare ftraight line BC fuch fuppofe fuppofition given rectilineal given ſtraight line Gnomon greater hath himſelf impoffible infcribed joined lefs leſs let the ftraight magnitudes moſt muſt neceffary parallelogram PROP propofition proportionals purpoſe reader reaſon rectangle contained rectilineal figure remaining angle remaining fides right angles ſame ſay ſhall ſhould ſome ſquare ſtraight line AB ſubject ſuch ſuppoſe taken theſe thoſe tiple triangle ABC underſtand uſe Wherefore becauſe
Popular passages
Page 3 - Let it be granted that a straight line may be drawn from any one point to any other point.
Page 47 - 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...
Page 68 - If a straight line drawn through the centre of a circle bisect a straight line in it which does not pass through the centre, it shall cut it at right angles : and if it cut it at right angles, it shall bisect it.
Page 45 - ABG ; (vi. 1.) therefore the triangle ABC has to the triangle ABG the duplicate ratio of that which BC has to EF: but the triangle ABG is equal to the triangle DEF; therefore also the triangle ABC has to the triangle DEF the duplicate ratio of that which BC has to EF. Therefore similar triangles, &c.
Page 15 - When a straight line set up on a straight line makes the adjacent angles equal to one another, each of the equal angles is right, and the straight line standing on the other is called a perpendicular to that on which it stands.
Page 86 - When you have proved that the three angles of every triangle are equal to two right angles...
Page 88 - 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 42 - If four straight lines be proportionals, the rectangle contained by the extremes is equal to the rectangle contained by the means ; And if the rectangle contained by the extremes be equal to the rectangle contained by the means, the four straight lines are proportionals. Let the four straight lines, AB, CD, E, F, be proportionals, viz.
Page 109 - Draw two diameters AC, BD of the circle ABCD, at right angles to one another; and through the points A, B. C, D, draw (17.
Page 8 - GB is equal to E, and CK to F ; therefore AB is the same multiple of E, that KH is of F: But AB...