Elements of Geometry;: Containing the First Six Books of Euclid, with Two Books on the Geometry of Solids. To which are Added, Elements of Plane and Spherical TrigonometryBell & Bradfute, and G. G. & J. Robinson, London., 1795 - 400 Seiten |
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Seite 9
... wherefore AL and BC are each of them equal to BG ; and things that are equal to the fame are equal to one another ; therefore the ftraight line AL is equal to BC . Wherefore from the given point A a ftraight line AL has been drawn equal ...
... wherefore AL and BC are each of them equal to BG ; and things that are equal to the fame are equal to one another ; therefore the ftraight line AL is equal to BC . Wherefore from the given point A a ftraight line AL has been drawn equal ...
Seite 10
... wherefore also the point C fhall coincide with the point F , because AC is equal to DF : But the point B coincides with the point E ; wherefore the base BC fhall co- a cor.def.3.incide with the base EF a , and fhall be equal to it ...
... wherefore also the point C fhall coincide with the point F , because AC is equal to DF : But the point B coincides with the point E ; wherefore the base BC fhall co- a cor.def.3.incide with the base EF a , and fhall be equal to it ...
Seite 11
... wherefore the triangles BFC , CGB are equal b , and their remaining angles are equal , to which the equal fides are oppofite ; therefore the angle FBC is equal to the angle GCB , and the angle BCF to the angle CBG . Now , fince it has ...
... wherefore the triangles BFC , CGB are equal b , and their remaining angles are equal , to which the equal fides are oppofite ; therefore the angle FBC is equal to the angle GCB , and the angle BCF to the angle CBG . Now , fince it has ...
Seite 12
... is abfurd . Therefore AB is not unequal to AC , that is , it is equal to it . Wherefore , if two angles , & c . QE . D. COR . Hence every equiangular triangle is alfo equilateral . B PROP . 13 U PROP . VII . THEOR . Book I. 12 ELEMENTS.
... is abfurd . Therefore AB is not unequal to AC , that is , it is equal to it . Wherefore , if two angles , & c . QE . D. COR . Hence every equiangular triangle is alfo equilateral . B PROP . 13 U PROP . VII . THEOR . Book I. 12 ELEMENTS.
Seite 15
... wherefore likewife the angle BAC coincides with the angle EDF , and is equal b to b 8. Ax . it . Therefore if two triangles , & c . Q. E. D. T PROP . IX . PROB . " O bisect a given rectilineal angle , that is , to di- vide it into two ...
... wherefore likewife the angle BAC coincides with the angle EDF , and is equal b to b 8. Ax . it . Therefore if two triangles , & c . Q. E. D. T PROP . IX . PROB . " O bisect a given rectilineal angle , that is , to di- vide it into two ...
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ABCD adjacent angles alfo alfo equal alſo angle ABC angle ACB angle BAC arch bafe baſe BC is equal becauſe the angle bifected Book VII cafe centre circle ABC circumference co-fine defcribed demonftrated diameter draw drawn equal angles equiangular equilateral equilateral polygon equimultiples Euclid exterior angle faid fame manner fame ratio fame reaſon fecond fection fegment femicircle fhewn fimilar fince firft firſt folid fore fquare of AC ftraight line AB fuch given ſtraight line greater impoffible infcribed interfection join lefs leſs Let ABC line BC magnitudes muſt oppofite angle parallel parallelepiped parallelogram perpendicular polygon prifm propofition proportionals radius rectangle contained rectilineal figure remaining angle right angles ſpace ſpherical triangle ſquare tangent thefe THEOR theſe thoſe touches the circle triangle ABC wherefore
Beliebte Passagen
Seite 18 - 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...
Seite 155 - 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 17 - If, at a point in a straight line, two other straight lines upon the opposite sides of it, make the adjacent angles, together equal to two right angles, these two straight lines shall be in one and the same straight line.
Seite 9 - Wherefore, from the given point A, a straight line AL has been drawn equal to the given straight line BC.
Seite 3 - A circle is a plane figure contained by one line, which is called the circumference, and is such that all straight lines drawn from a certain point within the figure to the circumference, are equal to one another.
Seite 23 - 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.
Seite 12 - ABC: and it has also been proved that the angle FBC is equal to the angle GCB, which are the angles upon the other side of the base. Therefore the angles at the base, &c.
Seite 6 - Let it be granted that a straight line may be drawn from any one point to any other point.
Seite 156 - But by the hypothesis, it is less than a right angle ; which is absurd. Therefore the angles ABC, DEF are not unequal, that is, they are equal : And the angle at A is equal to the angle at D ; wherefore...
Seite 44 - If a straight line be bisected, and produced to any point ; the rectangle contained by the whole line thus produced, and the part of it produced...