The Element of GeometryW.E. Dean, 1836 - 114 Seiten |
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Seite 11
... half the sum of all the angles on one side of a straight line ( Def . 27. ) ; therefore all right an- gles are equal . COR . III . The angles which one straight line makes with another on the same side of it , are together equal to two ...
... half the sum of all the angles on one side of a straight line ( Def . 27. ) ; therefore all right an- gles are equal . COR . III . The angles which one straight line makes with another on the same side of it , are together equal to two ...
Seite 16
... half AB , describe the arc DFE ; from B , with the same radius , describe the arc DGE , intersecting DFE in D , E , and join DE , intersecting AB at C ; AB is bisected at C. Join AD , BD , BE , AE . Because the two trian- gles ADE , BDE ...
... half AB , describe the arc DFE ; from B , with the same radius , describe the arc DGE , intersecting DFE in D , E , and join DE , intersecting AB at C ; AB is bisected at C. Join AD , BD , BE , AE . Because the two trian- gles ADE , BDE ...
Seite 19
... half of AF , is less than AC , the half of ACF ; therefore the perpendicular is shorter than any oblique . Because the triangles ABC , ABE have the side BC equal to the side BE , the side AB common , and the contained angle ABC equal to ...
... half of AF , is less than AC , the half of ACF ; therefore the perpendicular is shorter than any oblique . Because the triangles ABC , ABE have the side BC equal to the side BE , the side AB common , and the contained angle ABC equal to ...
Seite 32
... half a parallelogram , of equal base and altitude . Let the triangle ECD , and the parallelogram ABDC , be of equal base and altitude : ECD shall be equal to half ABCD . Let them be applied so as to coincide with the base CD , and ...
... half a parallelogram , of equal base and altitude . Let the triangle ECD , and the parallelogram ABDC , be of equal base and altitude : ECD shall be equal to half ABCD . Let them be applied so as to coincide with the base CD , and ...
Seite 33
... half the parallelogram ECDF ; and therefore it is equal to half the parallelogram ABCD . Q. E. D. 1 COR . I. Triangles of equal base and altitude , are equal . COR . II . Equal triangles of equal bases , are of equal altitude . PROP ...
... half the parallelogram ECDF ; and therefore it is equal to half the parallelogram ABCD . Q. E. D. 1 COR . I. Triangles of equal base and altitude , are equal . COR . II . Equal triangles of equal bases , are of equal altitude . PROP ...
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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...