A companion to Euclid: being a help to the understanding and remembering of the first four books. With a set of improved figures, and an original demonstration of the proposition called in Euclid the twelfth axiom, by a graduate |
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Resultat 1-5 av 7
Side 6
Many demonstrations which at first appeared very intricate will thus become clear
and intelligible ; for though the proof of a ... yet the proofs of these steps
themselves are always easy and always short : so that the student will find ( after
a little ...
Many demonstrations which at first appeared very intricate will thus become clear
and intelligible ; for though the proof of a ... yet the proofs of these steps
themselves are always easy and always short : so that the student will find ( after
a little ...
Side 7
... lines which are most strongly marked form the immediate object of the
proposition ; lines of secondary importance to these are more faintly traced ;
whilst the dotted lines are those which are merely introduced for the sake of the
proof , & c .
... lines which are most strongly marked form the immediate object of the
proposition ; lines of secondary importance to these are more faintly traced ;
whilst the dotted lines are those which are merely introduced for the sake of the
proof , & c .
Side 14
The nature of the proof of this proposition is different from that of the preceding
ones . This is an instance of the argument ad absurdum , i . e . , it is proved that
the theorem cannot be supposed false , without leading us to a manifest
absurdity ...
The nature of the proof of this proposition is different from that of the preceding
ones . This is an instance of the argument ad absurdum , i . e . , it is proved that
the theorem cannot be supposed false , without leading us to a manifest
absurdity ...
Side 27
... shows the supposition to be false , PROPOSITION XXX . . Theorem . Straight
lines which are. and . . that _ AGH = _ GHD . 4 . Prove that ZS EGB = L GHD , that
ZS EGB + BGH = US BGH + GHD , that Z8 BGH + GHD = 2 right Zs . * The proof ...
... shows the supposition to be false , PROPOSITION XXX . . Theorem . Straight
lines which are. and . . that _ AGH = _ GHD . 4 . Prove that ZS EGB = L GHD , that
ZS EGB + BGH = US BGH + GHD , that Z8 BGH + GHD = 2 right Zs . * The proof ...
Side 53
The proof of this proposition consists of two parts . I . That AF is the greatest , and
Fd the least , of all lines drawn from F to the O ; and that FB > FC , and FC > FG . II
. That upon each side of the shortest line FD , there can be drawn from point F ...
The proof of this proposition consists of two parts . I . That AF is the greatest , and
Fd the least , of all lines drawn from F to the O ; and that FB > FC , and FC > FG . II
. That upon each side of the shortest line FD , there can be drawn from point F ...
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Vanlige uttrykk og setninger
alternate angle contained angle equal applied Argument ad absurdum base bisect BOOK centre circumference coincides construction Demonstration described diameter directed divided draw drawn Edition Engravings equal equiangular equilateral Euclid extremities fall figure given circle given point given rectilineal given straight line greater HISTORY impossible inscribe interior joins learner least less meet Nature necessary opposite parallel parallelogram pass pentagon point of contact Problem produced proof PROPOSITION PROPOSITION VIII PROPOSITION XV Proved by showing READINGS rectangle contained right angles right line right Zs segment shows the supposition sides similarly square Steps straight line Suppose supposition is false Theorem touch triangle VOLUME whole whole line YOUNG
Populære avsnitt
Side 24 - 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, namely, either t}le sides adjacent to the equal...
Side 45 - To divide a given straight line 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.
Side 18 - 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.
Side 61 - From this it is manifest that the straight line which is drawn at right angles to the diameter of a circle from the extremity of it, touches the circle...
Side 37 - In any right-angled triangle, the square which is described upon the side subtending the right angle, is equal to the squares described upon the sides which contain the right angle.
Side 76 - IF from any point without a circle two straight lines be drawn, one of which cuts the circle, and the other touches it ; the rectangle contained by the whole line which cuts the circle, and the part of it without the circle, shall be equal to the square of the line which touches it.
Side 77 - If from a point without a circle there be drawn two straight lines, one of which cuts the circle, and the other meets it, and 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 on GEOMETRY.
Side 72 - If a straight line touch a circle, and from the point of contact a straight line be drawn at right angles to the touching line, the centre of the circle shall be in that line.
Side 27 - If a straight line fall on two parallel straight lines, it makes the alternate angles equal to one another, and the exterior angle equal to the interior and opposite angle on the same side; and also the two interior angles on the same side together equal to two right angles.
Bibliografisk informasjon
| Tittel | A companion to Euclid: being a help to the understanding and remembering of the first four books. With a set of improved figures, and an original demonstration of the proposition called in Euclid the twelfth axiom, by a graduate |
| Forfatter | Euclides |
| Utgiver | John W. Parker, 1837 |
| Original fra | Oxford University |
| Digitalisert | 16. okt 2006 |
| Lengde | 88 sider |
| Eksporter sitat | BiBTeX EndNote RefMan |