Euclid's Elements of Geometry: The First Six, the Eleventh and Twelfth Books |
From inside the book
Page 4
... drawn from a given point in a plane to a given right line in that plane , fo the longeft right line that can be drawn from that point to [ or rather towards ] that given right line , is pa- rallel to it . But Euclid's definition of ...
... drawn from a given point in a plane to a given right line in that plane , fo the longeft right line that can be drawn from that point to [ or rather towards ] that given right line , is pa- rallel to it . But Euclid's definition of ...
Page 18
... draw the right lines CG , CH , CE : I fay , that the right line C H is EB drawn from the given point C , without the given infinite right line A B perpendicular to it . For because G H is equal to the right line HE , and the right line ...
... draw the right lines CG , CH , CE : I fay , that the right line C H is EB drawn from the given point C , without the given infinite right line A B perpendicular to it . For because G H is equal to the right line HE , and the right line ...
Page 19
... drawn the perpendicular C H to it . Which was to be done . It was very right in Euclid to fuppofe an infinite right line in this problem ; for if it were a finite right line , a right line could not always be drawn from a given point ...
... drawn the perpendicular C H to it . Which was to be done . It was very right in Euclid to fuppofe an infinite right line in this problem ; for if it were a finite right line , a right line could not always be drawn from a given point ...
Page 20
... drawn contrary ways do make , with the first line , the adjacent angles equal to two right angles , thofe right lines will be directly placed to one another , or both fall into one right linee . For at the point B in the right line A B ...
... drawn contrary ways do make , with the first line , the adjacent angles equal to two right angles , thofe right lines will be directly placed to one another , or both fall into one right linee . For at the point B in the right line A B ...
Page 35
... drawn from angles lefs than two right angles , may in fome manner be for ever prolonged , yet hall they never meet together ; and ( as he thinks ) has given a demonftration thereof . But he has miftook the matter . Let us fee what he ...
... drawn from angles lefs than two right angles , may in fome manner be for ever prolonged , yet hall they never meet together ; and ( as he thinks ) has given a demonftration thereof . But he has miftook the matter . Let us fee what he ...
Other editions - View all
Euclid's Elements of Geometry: The First Six, the Eleventh and Twelfth Books Euclid,David Gregory No preview available - 2023 |
Euclid's Elements of Geometry: The First Six, the Eleventh and Twelfth Books Euclid,David Gregory No preview available - 2023 |
Euclid's Elements of Geometry: The First Six, the Eleventh and Twelfth Books Euclid,David Gregory No preview available - 2016 |
Common terms and phrases
A B C D alfo alſo angle ABC becauſe the angle bifected centre circle A B C circumference cone confequent cylinder defcribed demonftrated diameter equal angles equiangular equimultiples Euclid EUCLID's ELEMENTS fame altitude fame multiple fame ratio fame reafon fecond fegment femidiameter fhall fides A B fimilar fince firft firſt fixth folid angle folid parallelepipedon fome fphere ftand given circle given right line given triangle greater infcribed interfect join leffer lefs leſs parallel parallelogram perpendicular polygon prifm PROP propofition proportional pyramid rectangle contained regular polygon remaining angle right angles right line A B right lined figure right-lined SCHOLIUM ſquare thefe THEOR theſe thofe thoſe trapezium triangle ABC twice the fquare vertex the point Wherefore whofe bafe whoſe baſe
Popular passages
Page 247 - 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.
Page 30 - 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...
Page 248 - But it was proved that the angle AGB is equal to the angle at F ; therefore the angle at F is greater than a right angle : But by the hypothesis, it is less than a right angle ; which is absurd.
Page 18 - When a straight line set up on a straight line makes the adjacent angles equal to one another, each of the equal angles is right, and the straight line standing on the other is called a perpendicular to that on which it stands.
Page 32 - Let the straight line EF, which falls upon the two straight lines AB, CD, make the alternate angles AEF, EFD equal to one another; AB is parallel to CD.
Page 56 - 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.
Page 391 - KL: but the cylinder CM is equal to the cylinder EB, and the axis LN to the axis GH; therefore as the cylinder EB to...
Page 110 - If any two points be taken in the circumference of a circle, the straight line which joins them shall fall within the circle.
Page 130 - When you have proved that the three angles of every triangle are equal to two right angles...
Page 183 - FK : in the same manner it may be demonstrated, that FL, FM, FG are each of them equal to FH, or FK : therefore the five straight lines FG, FH, FK, FL, FM are equal to one another : wherefore the circle described from the centre F, at the distance of...