Elements of Geometry;: Containing the First Six Books of Euclid, with a Supplement on the Quadrature of the Circle and the Geometry of Solids; to which are Added, Elements of Plane and Spherical TrigonometryBell & Bradfute, 1804 - 440 sider |
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Side 3
... drawn from a certain point within the figure to the circum- ference , are equal to one another . XII . And this point is called the centre of the circle . XIII . A diameter of a circle is a ftraight line drawn through the centre , and ...
... drawn from a certain point within the figure to the circum- ference , are equal to one another . XII . And this point is called the centre of the circle . XIII . A diameter of a circle is a ftraight line drawn through the centre , and ...
Side 8
... draw the straight b1 . Poft . lines CA , CB to the nition . points A , B : ABC fhall be an equilateral triangle ... draw a ftraight line equal to a given ftraight line . FRO Let A be the given point , and BC the given ftraight line ; it ...
... draw the straight b1 . Poft . lines CA , CB to the nition . points A , B : ABC fhall be an equilateral triangle ... draw a ftraight line equal to a given ftraight line . FRO Let A be the given point , and BC the given ftraight line ; it ...
Side 9
... draw a the straight line AB ; and upon it defcribe the equilateral triangle DAB , and produce the ftraight lines DA ... drawn equal to the given straight line BC . Which was to be done . FROM PROP . III . PROB . ROM the greater of two ...
... draw a the straight line AB ; and upon it defcribe the equilateral triangle DAB , and produce the ftraight lines DA ... drawn equal to the given straight line BC . Which was to be done . FROM PROP . III . PROB . ROM the greater of two ...
Side 16
... draw a ftraight line from the point C at right angles to AB . the F Take any point D in AC , and a make CE equal to CD , and upon DE defcribe equilateral triangle DFE , and join FC ; the straight line FC , drawn from the gi- ven point C ...
... draw a ftraight line from the point C at right angles to AB . the F Take any point D in AC , and a make CE equal to CD , and upon DE defcribe equilateral triangle DFE , and join FC ; the straight line FC , drawn from the gi- ven point C ...
Side 17
... drawn from the given point C , is perpendicular to the given straight line AB . C I. d 8. I. Because FH is equal to HG , and HC common to the two triangles FHC , GHC , the two fides FH , HC are equal to the two GH , HC , each to each ...
... drawn from the given point C , is perpendicular to the given straight line AB . C I. d 8. I. Because FH is equal to HG , and HC common to the two triangles FHC , GHC , the two fides FH , HC are equal to the two GH , HC , each to each ...
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Almindelige termer og sætninger
ABC is equal ABCD alfo alſo angle ABC angle ACB angle BAC arch bafe baſe becauſe the angle bifected Book cafe centre circle ABC circumference co-fine cof BC cylinder defcribed demonftrated diameter draw drawn equal angles equiangular equilateral polygon equimultiples Euclid exterior angle faid fame altitude fame manner fame plane fame ratio fame reaſon fecond fection fegment femicircle fhall fhewn fide BC fides fince firft firſt folid fore fquare fuch given ftraight line greater infcribed interfect join lefs leſs Let ABC line BC magnitudes muſt oppofite angle parallel parallelepipeds parallelogram perpendicular polygon prifm propofition proportionals Q. E. D. PROP radius reafon rectangle contained rectilineal figure remaining angle ſpherical triangle ſquare tangent THEOR theſe thofe thoſe triangle ABC uſe wherefore
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Side 27 - 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...
Side 172 - 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.
Side 42 - The complements of the parallelograms, which are about the diameter of any parallelogram, are equal to one another.
Side 84 - The diameter is the greatest straight line in a circle; and of all others, that which is nearer to the centre is always greater than one more remote; and the greater is nearer to the centre than the less. Let ABCD be a circle, of which...
Side 106 - IF from a point without a circle there be drawn two straight lines, one of which cuts the circle, and the other meets it ; if the rectangle contained by the whole line which cuts the circle, and the part of it without the circle be equal to the square of the line which meets it, the line which meets shall touch the circle.
Side 22 - THE greater angle of every triangle is subtended by the greater side, or has the greater side opposite to it. Let ABC be a triangle, of which the angle ABC is greater than the angle BCA : the side AC is likewise greater than the side AB. For, if it be not greater, AC must...
Side 64 - If then the sides of it, BE, ED are equal to one another, it is a square, and what was required is now done: But if they are not equal, produce one of them BE to F, and make EF equal to ED, and bisect BF in G : and from the centre G, at the distance GB, or GF, describe the semicircle...
Side 166 - IN a right angled triangle, if a perpendicular be drawn from the right angle to the base, the triangles on each side of it are similar to the whole triangle, and to one another. Let ABC be a right angled triangle, having the right angle BAC ; and from the point A let AD be drawn perpendicular to the base BC : the triangles ABD, ADC are similar to the whole triangle ABC, and to one another.
Side 54 - 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...
Side 2 - When a straight line standing on another straight line makes the adjacent angles equal to one another, each of the angles is called a right angle; and the straight line which stands on the other is called a perpendicular to it.