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, 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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Σελίδα 196
And because AB is perpendicular to the plane , it is perpendicular to every stright
2. 3. Def.s1 . line which meets it , and is in that plane " . therefore each of the
angles ABD , ABE , is a right angle , and because the straight line BD meets the ...
And because AB is perpendicular to the plane , it is perpendicular to every stright
2. 3. Def.s1 . line which meets it , and is in that plane " . therefore each of the
angles ABD , ABE , is a right angle , and because the straight line BD meets the ...
Σελίδα 199
therefore GH is perpendicular to AF , and consequently AF , is Book Xi .
perpendicular to GH . and AF is perpendicular to DE ; therefore AF is
perpendicular to each of the straight lines GH , DE . but if a straight line stands at
right angles to each ...
therefore GH is perpendicular to AF , and consequently AF , is Book Xi .
perpendicular to GH . and AF is perpendicular to DE ; therefore AF is
perpendicular to each of the straight lines GH , DE . but if a straight line stands at
right angles to each ...
Σελίδα 201
From the point B draw BG perpendicular to the plane which 2. 11. 11 . passes
through DE , EF , and let it meet that plane in G ; and through G draw GH parallel
b to ED , and GK parallel to EF . b . 31. s . and because BG is perpendicular to the
...
From the point B draw BG perpendicular to the plane which 2. 11. 11 . passes
through DE , EF , and let it meet that plane in G ; and through G draw GH parallel
b to ED , and GK parallel to EF . b . 31. s . and because BG is perpendicular to the
...
Σελίδα 204
Def.si. sight angles to CE the common fection of the planes , has been proved to
be perpendicular to the other plane CK ; therefore the plane DE is at right angles
to the plane CK . In like manner , it may be proved that all the planes which pass
...
Def.si. sight angles to CE the common fection of the planes , has been proved to
be perpendicular to the other plane CK ; therefore the plane DE is at right angles
to the plane CK . In like manner , it may be proved that all the planes which pass
...
Σελίδα 218
In the straight line DF take any point F , from which draw FG perpendicular to the
plane EDC , meeting that plane in G ; 6. 43. So join DG , and at the point A in the
straight line AB make the angle BAL equal to the angle EDC , and in the plane ...
In the straight line DF take any point F , from which draw FG perpendicular to the
plane EDC , meeting that plane in G ; 6. 43. So join DG , and at the point A in the
straight line AB make the angle BAL equal to the angle EDC , and in the plane ...
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Συχνά εμφανιζόμενοι όροι και φράσεις
added alſo altitude angle ABC angle BAC baſe becauſe Book caſe circle circle ABCD circumference common cone cylinder Definition demonſtrated deſcribed diameter divided double draw drawn equal equal angles equiangular equimultiples exceſs fame fides figure firſt folid angle fore four fourth given angle given in poſition given magnitude given ratio given ſtraight line greater half join leſs likewiſe magnitude manner meet multiple muſt oppoſite parallel parallelogram perpendicular plane produced PROP proportionals Propoſition pyramid radius reaſon rectangle rectangle contained rectilineal remaining right angles ſame ſecond ſegment ſhall ſides ſimilar ſolid ſphere ſquare ſquare of AC taken THEOR theſe third thro triangle ABC wherefore whole
Δημοφιλή αποσπάσματα
Σελίδα 156 - 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.
Σελίδα 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.
Σελίδα 323 - Equiangular parallelograms have to one another the ratio which is compounded of the ratios of their sides.
Σελίδα 92 - 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.
Σελίδα 80 - EA : and because AD is equal to DC, and DE common to the triangles ADE, CDE, the two sides AD, DE are equal to the two CD, DE, each to each ; and the angle ADE is equal to the angle CDE, for each of them is a right angle ; therefore the base AE is equal (4.
Σελίδα 52 - If a straight line be bisected, and produced to any point, the square of the whole line thus produced, and the square of the part of it produced, are together double of the square of half the line bisected, and of the square of the line made up of the half and the part produced.
Σελίδα 36 - To a given straight line to apply a parallelogram, which shall be equal to a given triangle, and have one of its angles equal to a given rectilineal angle.
Σελίδα 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.
Σελίδα 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.
Σελίδα 74 - The straight line drawn at right angles to the diameter of a circle, from the extremity of it, falls without the circle...