The Element of GeometryW.E. Dean, 1836 - 114 Seiten |
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Seite 28
... third side BC common ( 7. 1. ) , they are equivalent ; and therefore the angle ABC is equal to the angle BCD ; and therefore AB ( Cor . 1. 2. 2. ) is parallel to CD ; and because the angle ACB is equal to the angle CBD , AC is parallel ...
... third side BC common ( 7. 1. ) , they are equivalent ; and therefore the angle ABC is equal to the angle BCD ; and therefore AB ( Cor . 1. 2. 2. ) is parallel to CD ; and because the angle ACB is equal to the angle CBD , AC is parallel ...
Seite 29
... third angle of the one is equal to the third angle of the other , viz . the side AB to the side CD , and AC to BD , and the angle BAC is equal to the angle BDC ; and because the angle ABC is equal to the an- gle BCD , and the angle CBD ...
... third angle of the one is equal to the third angle of the other , viz . the side AB to the side CD , and AC to BD , and the angle BAC is equal to the angle BDC ; and because the angle ABC is equal to the an- gle BCD , and the angle CBD ...
Seite 63
... third to the fourth , the quantities may be said to be in geometrical pro- portion . IV . In treating of proportion it is usual to employ a number , line , or let- ter , to express the quantity , and to consider the quantity without re ...
... third to the fourth , the quantities may be said to be in geometrical pro- portion . IV . In treating of proportion it is usual to employ a number , line , or let- ter , to express the quantity , and to consider the quantity without re ...
Seite 64
... third , means . XII . XIII . If the ratio of every two adjacent terms is the same , the tion may be said to be ... third , the ratio of the first to the third is compounded of the ra- tio of the first to the second , and of the second to ...
... third , means . XII . XIII . If the ratio of every two adjacent terms is the same , the tion may be said to be ... third , the ratio of the first to the third is compounded of the ra- tio of the first to the second , and of the second to ...
Seite 68
... third has to the fourth ; and the fifth to the second , the same ratio which the sixth has to the fourth ; the first and fifth together shall have to the second , the same ratio which the third and sixth together have to the fourth ...
... third has to the fourth ; and the fifth to the second , the same ratio which the sixth has to the fourth ; the first and fifth together shall have to the second , the same ratio which the third and sixth together have to the fourth ...
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...