The Element of GeometryW.E. Dean, 1836 - 114 Seiten |
Im Buch
Ergebnisse 6-10 von 30
Seite 19
... common , and the contained angle ABC equal to the contained an- gle FBC ; therefore the triangles are equivalent ( 4. 1. ) , and the side AC is equal to the side FC . But AF is a straight line , and therefore it is less than ACF ( Def ...
... common , and the contained angle ABC equal to the contained an- gle FBC ; therefore the triangles are equivalent ( 4. 1. ) , and the side AC is equal to the side FC . But AF is a straight line , and therefore it is less than ACF ( Def ...
Seite 26
... common vertex of the tri- angles ; that is ( Cor . 2. 3. 1. ) , together with four right angles . Therefore all the angles of the figure , together with A F B four right angles , are equal to twice as many right angles as the figure has ...
... common vertex of the tri- angles ; that is ( Cor . 2. 3. 1. ) , together with four right angles . Therefore all the angles of the figure , together with A F B four right angles , are equal to twice as many right angles as the figure has ...
Seite 28
... common ; therefore ( 4. 1. ) the triangles ABC , BCD are equivalent , and the side AC is equal to the side BD , and the angle ACB to the angle CBD ; and therefore ( Cor . 1. 2. 2. ) AC is parallel to BD . 1 PROP . VIII . THEOR . If two ...
... common ; therefore ( 4. 1. ) the triangles ABC , BCD are equivalent , and the side AC is equal to the side BD , and the angle ACB to the angle CBD ; and therefore ( Cor . 1. 2. 2. ) AC is parallel to BD . 1 PROP . VIII . THEOR . If two ...
Seite 31
... common angle BAC , and the remain- A B C D ing angle ACB is less than the remaining angle ACD ; and the angle ACD is composed of the angles ACB , BCD ; and because the straight lines BC , CD make an angle , if they are produced , the ...
... common angle BAC , and the remain- A B C D ing angle ACB is less than the remaining angle ACD ; and the angle ACD is composed of the angles ACB , BCD ; and because the straight lines BC , CD make an angle , if they are produced , the ...
Seite 32
... common , the whole or the remainder AE is equal to the whole or the remainder DF . AB is also equal to AC , and the two EB , AB , are equal to the two , FD , DC , each to each ; and the angle FDC is equal to the angle EAB , because they ...
... common , the whole or the remainder AE is equal to the whole or the remainder DF . AB is also equal to AC , and the two EB , AB , are equal to the two , FD , DC , each to each ; and the angle FDC is equal to the angle EAB , because they ...
Andere Ausgaben - Alle anzeigen
The Element of Geometry (Classic Reprint) Formerly Chairman Department of Immunology John Playfair,John Playfair Keine Leseprobe verfügbar - 2017 |
Häufige Begriffe und Wortgruppen
AB is equal AC is equal adjacent angles angle ABC angle ACB angle BAC angle DEF arc AC base BC bisect called centre circle ABCD circle EFGH coincide described divided drawn duplicate ratio equal 17 equal angles equal circles equal to CD equiangular FGHKL fore four right angles given straight line gnomon greater homologous sides join less Let ABC Let the straight opposite angles parallel parallelogram perpendicular polygon PROB produced Q. E. D. PROP radius rectangle BC rectangle contained rectilineal figure remaining angle right angled triangle secant segment side AC similar sine square of AC straight line AB straight line AC THEOR touches the circle triangle ABC twice the rectangle wherefore whole angle
Beliebte Passagen
Seite 25 - 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 on the line between the points of section, is equal to the square on half the line.
Seite 13 - To draw a straight line through a given point parallel to a given straight line. Let A be the given point, and BC the given straight line ; it is required to draw a straight line E iR.
Seite 4 - To draw a straight line at right angles to a given straight line, from a given point in the same.
Seite 29 - In obtuse-angled triangles, if a perpendicular be drawn from either of the acute angles to the opposite side produced, the square on the side subtending the obtuse angle is greater than the squares on the sides containing the obtuse angle, by twice the rectangle contained by the side...
Seite 90 - The circumference of every circle is supposed to be divided into 360 equal parts, called degrees ; and each degree into 60 equal parts, called minutes ; and each minute into 60 equal parts, called seconds ; and these into thirds, &c.
Seite 87 - ... magnitudes there be taken more than its half, and from the remainder more than its half, and so on, there shall at length remain a magnitude less than the least of the proposed magnitudes.
Seite 1 - If two triangles have two sides of the one equal to two sides of the...
Seite 13 - If a side of any triangle be produced, the exterior angle is equal to the two interior and opposite angles; and the three interior angles of every triangle are together equal to two right angles.
Seite 64 - 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.
Seite 19 - If a straight line meet two straight lines, so as to make the two interior angles on the same side of it taken together less than two right angles...