The First Six Books of the Elements of Euclid: With Notes |
From inside the book
Results 1-5 of 52
Page 2
... never meet on either side , though inde- finitely produced . 29. A quadrilateral figure is a rectilineal figure , which is bounded by four right lines . 30. A parallelogram is a quadrilateral figure , whose Fig 29 ELEMENTS OF EUCLID ,
... never meet on either side , though inde- finitely produced . 29. A quadrilateral figure is a rectilineal figure , which is bounded by four right lines . 30. A parallelogram is a quadrilateral figure , whose Fig 29 ELEMENTS OF EUCLID ,
Page 3
... produced to any length in a right line . 3. That a circle may be described from any centre , See N. at any distance from that centre . AXIOMS . 1. Things , which are equal to the same , are equal to one another . 2. If equals be added ...
... produced to any length in a right line . 3. That a circle may be described from any centre , See N. at any distance from that centre . AXIOMS . 1. Things , which are equal to the same , are equal to one another . 2. If equals be added ...
Page 4
... produce the right line DB , until it meets the cir- cumference in G. From the centre D , with the radius DG , describe the circle GLO ; and produce the right line DA , until it meets the circumference in L. The right line AL is equal to ...
... produce the right line DB , until it meets the cir- cumference in G. From the centre D , with the radius DG , describe the circle GLO ; and produce the right line DA , until it meets the circumference in L. The right line AL is equal to ...
Page 6
... produced , the angles below the base ( FBC and GCB ) shall also be equal . Take any point F in the side produced , cut off AG ( 1 ) Prop . 3. equal to AF ( 1 ) , and join FC , GB . ( 2 ) Constr . & Hypoth . ( 3 ) Prop . 4 . ( 4 ) Ax , 3 ...
... produced , the angles below the base ( FBC and GCB ) shall also be equal . Take any point F in the side produced , cut off AG ( 1 ) Prop . 3. equal to AF ( 1 ) , and join FC , GB . ( 2 ) Constr . & Hypoth . ( 3 ) Prop . 4 . ( 4 ) Ax , 3 ...
Page 8
... produce the sides AC and AD , and join CD . Because the sides AC and AD of the triangle CAD * are equal ( 6 ) , the angles ECD and FDC are equal ( 7 ) ; but the angle BDC is greater than FDC ( 8 ) , and there- fore greater than ECD ...
... produce the sides AC and AD , and join CD . Because the sides AC and AD of the triangle CAD * are equal ( 6 ) , the angles ECD and FDC are equal ( 7 ) ; but the angle BDC is greater than FDC ( 8 ) , and there- fore greater than ECD ...
Common terms and phrases
absurd AC and BD AC and CB AC is equal angle ABC angle ACD angle BAC angle equal base bisected centre circumference Constr constructed contained in CD demonstrated described double the rectangle double the square drawn equal angles equal to AC equal to double equi equi-multiples equi-submultiples equiangular Euclid evident external angle fore form one right four magnitudes proportional four right angles fourth given angle given circle given line given right line given triangle gles half a right Hypoth inscribed less line CD manner multiple oftener opposite parallel parallelogram perpendicular PROB produced Prop proposition radius rectangle under AC right angles right line AB Schol segment side AC sides AB similar squares of AC submultiple taken tangent THEOR third tiple triangle ABC vertex
Popular passages
Page 147 - A plane rectilineal angle is the inclination of two straight lines to one another, which meet together, but are not in the same straight line.
Page 3 - Things which are equal to the same thing are equal to one another. 2. If equals be added to equals, the wholes are equal. 3. If equals be taken from equals, the remainders are equal. 4. If equals be added to unequals, the wholes are unequal. 5. If equals be taken from unequals, the remainders are unequal. 6. Things which are double of the same are equal to one another.
Page 22 - 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.
Page 16 - If two triangles have two sides of the one respectively equal to two sides of the other, and the contained angles supplemental, the two triangles are equal.
Page 148 - A plane angle is the inclination of two lines to one another in a plane, which meet together, but are not in the same direction.
Page 2 - A diameter of a circle is a straight line drawn through the centre, and terminated both ways by the circumference.
Page 92 - F) a ratio compounded of the ratios which the first has to the second, the second to the third, the third to the fourth (A to D, D to C, and C to F) ; and so on to the last.
Page 93 - AXIOMS. 1. Equimultiples of the same, or of equal magnitudes, are equal to one another. 2. Those magnitudes, of which the same or equal magnitudes are equimultiples, are equal to one another. 3. A multiple of a greater magnitude is greater than the same multiple of a less. 4. That magnitude, of which a multiple is greater than the same multiple of another, is greater than that other magnitude.
Page 25 - DE : but equal triangles on the same base and on the same side of it, are between the same parallels ; (i.
Page 2 - 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.