The Elements of Euclid, Viz: 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. the first six books, together with the eleventh and twelfthJ. Nourse, London, and J. Balfour, Edinburgh, 1775 - 520 σελίδες |
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Αποτελέσματα 1 - 5 από τα 34.
Σελίδα 17
... demonstrated . THE PROP . V. THEOR . HE angles at the base of an Ifofceles triangle are equal to one another ; and , if the equal fides be produced , the angles upon the other fide of the bafe fhall be equal . Let ABC be an Isofceles ...
... demonstrated . THE PROP . V. THEOR . HE angles at the base of an Ifofceles triangle are equal to one another ; and , if the equal fides be produced , the angles upon the other fide of the bafe fhall be equal . Let ABC be an Isofceles ...
Σελίδα 25
... demonstrated to be equal to two right angles ; wherefore the angles CEA , AED are equal to the angles AED , DEB . Take away the common angle AED , and the remaining angle CEA is equal to the remaining angle DEB . In the fame b 3. Ax ...
... demonstrated to be equal to two right angles ; wherefore the angles CEA , AED are equal to the angles AED , DEB . Take away the common angle AED , and the remaining angle CEA is equal to the remaining angle DEB . In the fame b 3. Ax ...
Σελίδα 26
... demonstrated that the angle BCG , that is , the angle ACD , is greater than the angle ABC . Therefore , if one fide , & c . Q. E. D. A PROP . XVII . THEOR . NY two angles of a triangle are together less than two right angles . Let ABC ...
... demonstrated that the angle BCG , that is , the angle ACD , is greater than the angle ABC . Therefore , if one fide , & c . Q. E. D. A PROP . XVII . THEOR . NY two angles of a triangle are together less than two right angles . Let ABC ...
Σελίδα 28
... demonstrated , that the fides AB , BC are greater than CA , and BC , CA greater than AB . Therefore any two fides , & c . Q. E. D. PROP . XXI . THEOR . from the ends of the fide of a triangle , there be drawn two straight lines to a ...
... demonstrated , that the fides AB , BC are greater than CA , and BC , CA greater than AB . Therefore any two fides , & c . Q. E. D. PROP . XXI . THEOR . from the ends of the fide of a triangle , there be drawn two straight lines to a ...
Σελίδα 43
... demonstrated that no other line but AD is parallel to BC ; AD is therefore parallel to it . Wherefore equal triangles upon , & c . Q. E. D. B PROP . XL . THEOR . Estraight line , and towards the fame parts , are be- QUAL triangles upon ...
... demonstrated that no other line but AD is parallel to BC ; AD is therefore parallel to it . Wherefore equal triangles upon , & c . Q. E. D. B PROP . XL . THEOR . Estraight line , and towards the fame parts , are be- QUAL triangles upon ...
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alfo alſo angle ABC angle BAC bafe baſe BC is equal BC is given becauſe the angle bifected Book XI cafe circle ABCD circumference cone confequently cylinder defcribed demonftrated diameter drawn equal angles equiangular equimultiples Euclid excefs faid fame manner fame multiple fame ratio fame reafon fecond fegment fhall fhewn fide BC fimilar firft firſt folid angle fome fore fphere 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 likewife line BC oppofite parallel parallelepipeds parallelogram perpendicular polygon prifm propofition proportionals pyramid Q. E. D. PROP rectangle contained rectilineal figure right angles thefe THEOR theſe triangle ABC vertex wherefore
Δημοφιλή αποσπάσματα
Σελίδα 32 - If two triangles have two angles of the one equal to two angles of the other, each to each, and one side equal to one side, viz. either the sides adjacent to the equal...
Σελίδα 165 - D ; wherefore the remaining angle at C is equal to the remaining angle at F ; Therefore the triangle ABC is equiangular to the triangle DEF.
Σελίδα 170 - 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.
Σελίδα 10 - When several angles are at one point B, any ' one of them is expressed by three letters, of which ' the letter that is at the vertex of the angle, that is, at ' the point in which the straight lines that contain the ' angle meet one another, is put between the other two ' letters, and one of these two is...
Σελίδα 55 - If a straight line be divided into two equal parts, and also into two unequal parts; the rectangle contained by the unequal parts, together with the square of the line between the points of section, is equal to the square of half the line.
Σελίδα 32 - ... then shall the other sides be equal, each to each; and also the third angle of the one to the third angle of the other. Let ABC, DEF be two triangles which have the angles ABC, BCA equal to the angles DEF, EFD, viz.
Σελίδα 45 - To describe a parallelogram that shall be equal to a given triangle, and have one of its angles equal to a given rectilineal angle.
Σελίδα 211 - AB shall be at right angles to the plane CK. Let any plane DE pass through AB, and let CE be the common section of the planes DE, CK ; take any point F in CE, from which draw FG in the plane DE at right D angles to CE ; and because AB is , perpendicular to the plane CK, therefore it is also perpendicular to every straight line in that plane meeting it (3.
Σελίδα 38 - F, which is the common vertex of the triangles ; that is, together with four right angles. Therefore all the angles of the figure, together with four right angles, are equal to twice as many right angles as the figure has sides.
Σελίδα 304 - Thus, if B be the extremity of the line AB, or the common extremity of the two lines AB, KB, this extremity is called a point, and has no length : For if it have any, this length must either be part of the length of the line AB, or of the line KB.