 | William Pease - Geometry - 1843 - 80 pages
...is that which is formed on the surface of a sphere, by the intersection of two of its great circles. X. When a straight line standing on another straight...the adjacent angles equal to one another, each of the angles is called a right angle ; and the straight line which stands on the other is called a perpendicular... | |
 | Euclid - Geometry - 1845 - 218 pages
...one angle at a point, it may be ' expressed by a letter placed at that point : as the angle ' at E.' X. When a straight line standing on another straight...the adjacent angles equal to one another, each of the angles is called a right angle ; and the straight tine which stands on the other is called a perpendicular... | |
 | Scottish school-book assoc - 1845 - 444 pages
...» only one angle at the point, as at E, it may be called simply the »ngle at E, PLANE GEOMETRY. 9. When a straight line standing on another straight...the adjacent angles equal to one another, each of the angles is called a right angle; and the strnight line which stands on the other is called a perpendicular... | |
 | Euclides - 1845 - 546 pages
...be only one angle at a point, it may be expressed by the letter at that point; as the angle at /.'. When a straight line standing on another straight line makes the adjacent angles equal to each other, each of these angles is called a right angle ; and the straight line which stands on the... | |
 | Euclid, John Playfair - Euclid's Elements - 1846 - 334 pages
...an1 gle at a point, it may be expressed by a letter placed at that point ; as the ' angle at £.' 7. When a straight line standing on another straight...the adjacent angles equal to one another, each of the angles is called a right angle ; and the straight line which stands on the other, is called a perpendicular... | |
 | W. PEASE - 1846 - 86 pages
...of two of its great circles. When an angle is mentioned simply, it means a rectilineal angle. 23*. When a straight line standing on another straight...the adjacent angles , equal to one another, each of the angles is called a right angle ; and the straight line which stands on the other is called a perpendicular... | |
 | Euclides - 1846 - 292 pages
...BE — therefore the angle AFE is equal to the angle BFE : But when a straight line, standing upon another straight line, makes the adjacent angles equal to one another, each of them is a right angle ; therefore each of the angles AFE, BFE is a right angle ; and therefore the... | |
 | Euclides - 1847 - 128 pages
...of the lines, by the meeting of which they are formed. See the Observation after Definition 18. 10. When a straight line, standing on another straight line, makes the adjacent an. gles equal to one another, each of the angles is called a right angle; and the straight line which... | |
 | Euclides - 1848 - 52 pages
...inclination of two straight lines to one another, which meet together, but are not in the same straight line. X. When a straight line standing on another straight line, makes the adjacent angles equal to each other, each of these angles is called a right angle ; and the straight line which stands on the... | |
 | Charles Richson - 1848 - 98 pages
...two straight lines to one another, which meet together, but are not in the same straight line." 2. "When a straight line standing on another straight line makes the adjacent angles equal to each other, each of these angles is called a right angle; and the straight line which stands on the... | |
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When a straight line standing on another straight line makes the adjacent angles equal to one another, each of the angles is called a right angle ; and the straight line which stands on the other is called a perpendicular to it. 
