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 18
... figure itself may lead us to a limited or partial conclufion ; the remedy for which I shall explain at length in the next differtation . The fimpleft kind of rectilineal figure is the triangle ; the dif ferent parts of which the learner ...
... figure itself may lead us to a limited or partial conclufion ; the remedy for which I shall explain at length in the next differtation . The fimpleft kind of rectilineal figure is the triangle ; the dif ferent parts of which the learner ...
Page 68
... 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 other plan in his demonstrations than to convince the ...
... 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 other plan in his demonstrations than to convince the ...
Page 69
... triangle or the circle ; with the triangle as being the fimpleft rectilineal figure ; or with the circle as being bounded by one fingle line ; the circle might probably have the preference upon a full examination as being a perfect figure ...
... triangle or the circle ; with the triangle as being the fimpleft rectilineal figure ; or with the circle as being bounded by one fingle line ; the circle might probably have the preference upon a full examination as being a perfect figure ...
Page 73
... figures a more regular fhape ; or in other words , that they wanted to perform the problem , which Euclid has given in the forty fifth propofition of his first book ; namely , to turn any rectilineal figure into a parallelogram having a ...
... figures a more regular fhape ; or in other words , that they wanted to perform the problem , which Euclid has given in the forty fifth propofition of his first book ; namely , to turn any rectilineal figure into a parallelogram having a ...
Page 86
... fuch fquares ; and the triangle fourteen of the fame . And as any rectilineal figure is divifible into triangles , upon thefe principles principles any rectilineal figure may have its contents expreft in 86 DISSERTATION IV .
... fuch fquares ; and the triangle fourteen of the fame . And as any rectilineal figure is divifible into triangles , upon thefe principles principles any rectilineal figure may have its contents expreft in 86 DISSERTATION IV .
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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...