The First Six Books with NotesR. Milliken, 1822 - 179 pages |
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Page 2
... perpendicular to it . 12. The angle ( ABC ) which is greater than a right angle , is called obtuse . 13. The angle ( ABD ) which is less than a right angle , is called acute . 7 14. A plane figure is a plane surface , which is bounded ...
... perpendicular to it . 12. The angle ( ABC ) which is greater than a right angle , is called obtuse . 13. The angle ( ABD ) which is less than a right angle , is called acute . 7 14. A plane figure is a plane surface , which is bounded ...
Page 9
... perpendicular to the given line . In the given line take any point D , and make CE equal to CD ( 1 ) ; upon DE describe an equilateral tri- ( 1 ) prop . 3 . angle DFE ( 2 ) , draw FC , and it is perpendicular ( 2 ) prop . 1 . to the ...
... perpendicular to the given line . In the given line take any point D , and make CE equal to CD ( 1 ) ; upon DE describe an equilateral tri- ( 1 ) prop . 3 . angle DFE ( 2 ) , draw FC , and it is perpendicular ( 2 ) prop . 1 . to the ...
Page 10
... perpendicular to the given right line AB at the ( 5 ) Def . 11 , point C ( 5 ) . . ( 4 ) Sch . prop . 8 . Fig.25 . See N. B Schol . In the same manner a perpendicular can be erected at one extremity of a given line , by first pro ...
... perpendicular to the given right line AB at the ( 5 ) Def . 11 , point C ( 5 ) . . ( 4 ) Sch . prop . 8 . Fig.25 . See N. B Schol . In the same manner a perpendicular can be erected at one extremity of a given line , by first pro ...
Page 12
... perpendicular falls at the side of the acute angle . For , if possible , let BA perpendicular to the line ED fall at the side of the obtuse angle BCE , then the ( 1 ) Def . 12. angle BAE is less than BCE ( 1 ) , but BAE is , ( 2 ) Prop ...
... perpendicular falls at the side of the acute angle . For , if possible , let BA perpendicular to the line ED fall at the side of the obtuse angle BCE , then the ( 1 ) Def . 12. angle BAE is less than BCE ( 1 ) , but BAE is , ( 2 ) Prop ...
Page 14
... perpendicular to ED , the other not , BC is less than BA . For in the triangle ABC the angle BAC is acute , since BCA is right ( 1 ) , therefore BC is opposite to Prop . 17 . the less angle , and therefore is less than BA , which ( 2 ) ...
... perpendicular to ED , the other not , BC is less than BA . For in the triangle ABC the angle BAC is acute , since BCA is right ( 1 ) , therefore BC is opposite to Prop . 17 . the less angle , and therefore is less than BA , which ( 2 ) ...
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Common terms and phrases
absurd AC and BD AC and CB AC are equal alternate angles angle ABC angle ACD angle BAC angle equal base bisected centre circumference CKMB Constr constructed contained in CD demonstrated double the rectangle double the square equal angles equal sides equal to AC equal to double equi equi-multiples equi-submultiples equiangular Euclid evident fore four magnitudes proportional four right angles given angle given circle given line given right line given triangle half a right Hypoth inscribed less line CD manner mean proportional multiple oftener parallel parallelogram perpendicular point of contact PROB produced Prop proposition radius rectangle under AC right line AB Schol segment side AC similar squares of AC submultiple taken tangent THEOR third tiple triangle ABC vertex
Popular passages
Page 145 - 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 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 : 16.
Page 28 - 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.
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 118 - A straight line is said to be cut in extreme and mean ratio, when the whole is to the greater segment as the greater segment is to the less.
Page 146 - 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 168 - The first of four magnitudes is said to have the same ratio to the second, which the third has to the fourth, when any equimultiples whatsoever of the first and third being taken, and any equimultiples whatsoever of the second and fourth ; if the multiple of the first be less than that of the second, the multiple of the third is also less than that of the fourth...
Page 3 - Things which are equal to the same thing are also equal to one another. 2. If equals be added to equals, the wholes are equal. 3. If equals be subtracted from equals, the remainders are equal. 4. Things which coincide with one another are equal to one another.
Page 25 - DE : but equal triangles on the same base and on the same side of it, are between the same parallels ; (i.
Page 3 - A rhombus is that which has all its sides equal, but its angles are not right angles.