The Elements of Euclid: The Errors, by which Theon, Or Others, Have Long Ago Vitiated These Books, are Corrected and Some of Euclid's Demonstrations are Restored. Also, to this Second Edition is Added the Book of Euclid's Data. In Like Manner Corrected. viz. the first six books, together with the eleventh and twelfth |
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Seite 3
A diameter of a circle is a straight line drawn thro ' the center , atid See Ni ' terminated both ways by the circumference . XVIII . A femicircle is the figure contained by a diameter and the part of the circumference cut off by the ...
A diameter of a circle is a straight line drawn thro ' the center , atid See Ni ' terminated both ways by the circumference . XVIII . A femicircle is the figure contained by a diameter and the part of the circumference cut off by the ...
Seite 28
To draw a straight line thro ' 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 thro ' E A F Α . the point A , parallel to the straight ...
To draw a straight line thro ' 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 thro ' E A F Α . the point A , parallel to the straight ...
Seite 29
drawn thro ' the given point A parallel to the given straight line BC . Book I. Which was to be done . E b . 19.1 . PROP . XXXII . THEOR . IF : a side of any triangle be produced , the exterior angie is equal to the two interior and ...
drawn thro ' the given point A parallel to the given straight line BC . Book I. Which was to be done . E b . 19.1 . PROP . XXXII . THEOR . IF : a side of any triangle be produced , the exterior angie is equal to the two interior and ...
Seite 33
Produce AD both ways to the points E , F , and thro ' B a . 31. t . draw a BE parallel to CA ; and thro ' C draw CF parallel B С to BD . therefore each of the figures EBCA , DBCr is a parallelogram ; and EBCA is equal to b .
Produce AD both ways to the points E , F , and thro ' B a . 31. t . draw a BE parallel to CA ; and thro ' C draw CF parallel B С to BD . therefore each of the figures EBCA , DBCr is a parallelogram ; and EBCA is equal to b .
Seite 34
Let the triangles ABC , DEF Le upon equal bases BC , EF , and between the fame parallels BF , AD . the triangle ABC is equal to the triangle DEF . Produce AD both ways to the points G , H , and thro'B draw.BG X. 31.
Let the triangles ABC , DEF Le upon equal bases BC , EF , and between the fame parallels BF , AD . the triangle ABC is equal to the triangle DEF . Produce AD both ways to the points G , H , and thro'B draw.BG X. 31.
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added alſo altitude angle ABC angle BAC baſe BC is given becauſe Book caſe circle circle ABCD circumference common cone contained cylinder Definition demonſtrated deſcribed diameter divided double draw drawn equal equal angles equiangular equimultiples exceſs fame fides firſt folid fore four fourth given angle given in poſition given in ſpecies given magnitude given ratio given ſtraight line greater Greek half join leſs likewiſe magnitude manner meet muſt oppoſite parallel parallelogram perpendicular plane priſm produced PROP proportionals Propoſition pyramid reaſon rectangle remaining right angles ſame ſecond ſegment ſhall ſhewn ſides ſimilar ſolid ſquare ſquare of BC taken THEOR theſe third thro triangle ABC wherefore whole
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Seite 5 - Let it be granted that a straight line may be drawn from any one point to any other point.
Seite 163 - 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 48 - If a straight line be divided into any two parts, the squares of the whole line, and of one of the parts, are equal to twice the rectangle contained by the whole and that part, together with the square of the other part. Let the straight line AB be divided into any two parts in the point C; the squares of AB, BC are equal to twice the rectangle AB, BC, together with the square of AC.
Seite 73 - The straight line drawn at right angles to the diameter of a circle, from the extremity of it, falls without the circle; and no straight line can be drawn from the extremity between that straight line and the circumference, so as not to cut the circle...
Seite 105 - 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 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 167 - Similar triangles are to one another in the duplicate ratio of their homologous sides.
Seite 54 - AB be the given straight line ; it is required to divide it into two parts, so that the rectangle contained by the whole, and one of the parts, shall be equal to the square of the other part.
Seite 47 - 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 of the line between the points of section, is equal to the square of half the line.
Seite 37 - To describe a parallelogram that shall be equal to a given triangle, and have one of its angles equal to a given rectilineal angle.