| Euclid, John Casey - Euclid's Elements - 1885 - 340 pages
...adjacent angles at both sides of itself equal, each of the angles is called a right angle, and the **line which stands on the other is called a perpendicular to it.** D Hence a right angle is equal to its supplement. xv. An acute angle is one which is less than a right... | |
| Euclides - 1885 - 340 pages
...adjacent angles at both sides of itself equal, each of the angles is called a right angle, and the **line which stands on the other is called a perpendicular to it.** Hence a right angle is equal to its supplement. xv. An acute angle is one which is less than a right... | |
| John Thornton - Physical geography - 1888 - 266 pages
...the following definition of a right angle : — ' When a straight line standing on another straight **line makes the adjacent angles equal to one another,...stands on the other is called a perpendicular to it.'** We find it convenient for the purposes of angular measurement to divide the right angle into smaller... | |
| Edward Mann Langley, W. Seys Phillips - 1890 - 538 pages
...instead of it. See Note 2 on Prop. 9. DEF. 10. — When a straight line standing on another straight **line makes the adjacent angles equal to one another,...and the straight line which stands on the other is** said to be perpendicular, or at right angles, to it. The symbol for ' perpendicular 'is x r. The student... | |
| Edward Albert Bowser - Geometry - 1890 - 414 pages
...said to bisect the angle between the non-coincident sides BA and BE. Fig. 6 Fig. 7 0 Fig. 8 O Fig. 9 **called a right angle; and the straight line which stands on the other is** said to be perpendicular or at right angles to it. Thus, if the adjacent angles AOC and BOC are equal... | |
| Euclid - Geometry - 1892 - 460 pages
...line, standing on another straight line, makes the adjacent angles equal to one another, each of these **angles is called a right angle, and the straight line...stands on the other is called a perpendicular to it.** Therefore CH is a perpendicular drawn to the given straight line AB from the given point C without... | |
| James Howard Gore - Geometry - 1898 - 232 pages
...other. 35. When a straight line standing on another makes the adjacent angles equal to each other, f **each of the angles is called a Right Angle; and the straight line which stands** ou the other side is said to be perpendicular or at right angles to it. A_ Thus, if the adjacent angles... | |
| Seymour Eaton - 1899 - 362 pages
...standing on another straight line makes the adjacent angles equal to one another, I v/ \ GB each of these **angles is called a right angle, and the straight line...stands on the other is called a perpendicular to it** (Definitions). Therefore CH is a perpendicular drawn to the given straight line AB from the given point... | |
| John Thornton - Physical geography - 1899 - 460 pages
...makes the adjaG. 9.— Pendulum swinging cent angles equal to one another, each through arc /«. r .1 **and the straight line which stands on the other is called a perpendicular to it."** Notice that " perpendicular " does not always mean upright, but making equal angles on both or all... | |
| Encyclopedias - 1898 - 610 pages
...6m, is named the angle с m Ъ. — When a straight line, cm, standing on another straight line, a b. **makes the adjacent angles equal to one another, each of the angles** erne, cmb, is culled a right anglr; and the straight lines are said to be perpendicular to each other.... | |
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