The Elements of Euclid |
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Side 12
Therefore , if two triangles have two sides of the one equal to two sides of the other , each to each , and have likewise ... Let ABC be an isosceles triangle , of which the side AB is equal to AC , and let the straight lines AB , AC be ...
Therefore , if two triangles have two sides of the one equal to two sides of the other , each to each , and have likewise ... Let ABC be an isosceles triangle , of which the side AB is equal to AC , and let the straight lines AB , AC be ...
Side 18
Wherefore , when a straight line , & c . Q. E. D. PROP . XIV . THEOR . Ip , 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 ...
Wherefore , when a straight line , & c . Q. E. D. PROP . XIV . THEOR . Ip , 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 ...
Side 26
Therefore , if two triangles , & c . Q. E. D. PROP . XXVII . THEOR . Ir a straight line falling upon two other straight lines makes the alternate angles equal to one another , these two straight lines shall be parallel .
Therefore , if two triangles , & c . Q. E. D. PROP . XXVII . THEOR . Ir a straight line falling upon two other straight lines makes the alternate angles equal to one another , these two straight lines shall be parallel .
Side 36
to two right angles : wherefore the angles BHF , HFE are less than two right angles : but straight lines which with another straight line make the interior angles upon the same side less than two right angles , do meet ( 12 . Ax . ) if ...
to two right angles : wherefore the angles BHF , HFE are less than two right angles : but straight lines which with another straight line make the interior angles upon the same side less than two right angles , do meet ( 12 . Ax . ) if ...
Side 38
the G two straight lines AC , AG upon the opposite sides of AB , make with it at the point A the adjacent angles equal to two right angles : F therefore CA is in the same K straight line ( 14. 1. ) with AG : for the same reason , AB and ...
the G two straight lines AC , AG upon the opposite sides of AB , make with it at the point A the adjacent angles equal to two right angles : F therefore CA is in the same K straight line ( 14. 1. ) with AG : for the same reason , AB and ...
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Populære avsnitt
Side 34 - 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 at the point C : the squares of AB, BC shall be equal to twice the rectangle AB, BC, together with the square of AC.
Side 143 - Wherefore, in equal circles &c. QED PROPOSITION B. THEOREM If the vertical angle of a triangle be bisected by a straight line which likewise cuts the base, the rectangle contained by the sides of the triangle is equal to the rectangle contained by the segments of the base, together with the square on the straight line which bisects the angle.
Side 63 - The angle in a semicircle is a right angle; the angle in a segment greater than a semicircle is less than a right angle; and the angle in a segment less than a semicircle is greater than a right angle.
Side 246 - Again ; the mathematical postulate, that " things which are equal to the same are equal to one another," is similar to the form of the syllogism in logic, which unites things agreeing in the middle term.
Side 9 - If one side of a triangle be produced, the exterior angle is greater than either of the interior opposite angles.
Side 119 - 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 19 - All the interior angles of any rectilineal figure, together with four right angles, are equal to twice as many right angles as the figure has sides.
Side 12 - To construct a triangle of which the sides shall be equal to three given straight lines ; but any two whatever of these lines must be greater than the third (20.
Side 78 - 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 131 - ... rectilineal figures are to one another in the duplicate ratio of their homologous sides.
Bibliografisk informasjon
| Tittel | The Elements of Euclid |
| Forfatter | Euclid |
| Redaktør | Robert Simson |
| Utgiver | Desilver, Thomas, 1838 |
| Original fra | Harvard University |
| Digitalisert | 29. sep 2005 |
| Lengde | 416 sider |
| Eksporter sitat | BiBTeX EndNote RefMan |