 | Robert Simson - Trigonometry - 1762 - 488 pages
...adjacent angles. but when the adjacent angles which one ftraight line makes with another ftraight line are e.qual to one another, each of them is called a right ,* angle ; therefore Def each of the angles DCF, ECF is a right angle. wherefore from the given point C in the... | |
 | Robert Simson - Trigonometry - 1827 - 546 pages
...angles. But when the adjacent angles which one straight line makes with another straight line, are equal to one another, each of them is called a right* angle; therefore each of the angles DCF, ECF, is a right angle. Wherefore, from the given point C, in the... | |
 | Mathematics - 1835 - 684 pages
...(Eue. i. det 10.) When a straight line standing; upon another straight line makes the adjacent angles equal to one another, each of them is called a right angle, and the straight line which stands upon the other is called a perpendicular to it. 11. If an angle be not right,... | |
 | Charles Reiner - Geometry - 1837 - 246 pages
...about each of its solid angles. 3. — When one line standing on another line makes the adjacent angles equal to one another, each of them is called a right angle. 4. — An angle which is greater than a right angle is called an obtuse angle. 5.— An angle which... | |
 | Euclides - Geometry - 1841 - 378 pages
...angles. But, when the adjacent angles which one straight line makes with another straight line are equal to one another, each of them is called a right* angle; therefore each of the *iODef. angles DCF, ECF, is a right angle. Therefore, from the given point C,... | |
 | Euclides - 1845 - 546 pages
...angles. But when the two adjacent angles which one straight line makes with another straight line are equal to one another, each of them is called a right angle: (def. 10.) Therefore each of the angles DCF, ECF is a right angle. Wherefore from the given point C,... | |
 | Elias Loomis - Conic sections - 1849 - 252 pages
...angles BCD, BCE. 10. When a straight line, meeting another straight line, makes the adjacent angles equal to one another, each of them is called a right angle, and the straight line which meets the other is called a perpendicular to it. 11. An acute angle is one which... | |
 | Sir Henry Edward Landor Thuillier - Surveying - 1851 - 826 pages
...straight line.* When a straight line standing upon another straight line makes the adjacent angles equal to one another, each of them is called a right angle, and the straight line which stands upon the other is called a perpendicular to it If an angle is not right... | |
 | Euclides - 1852 - 48 pages
...letters as, FAG. A 4 11. When a right line standing upon another right line makes the adjacent angles equal to one another, each of them is called a right angle ; and the right line which stands upon the other is called a perpendicular to it ; thus, if the line AB, standing... | |
 | Euclides - Geometry - 1853 - 176 pages
...angles. But, when the adjacent angles which one straight line makes with another straight line are equal to one another, each of them is called a right angle (10 def.); therefore each of the angles dc f, ecf, is a right angle. Wherefore, from the given point... | |
| |
Therefore each of the angles DCF, ECF is a right angle. Wherefore from the given point C, in the given straight line AB, FC has been drawn at right angles to AB. 
