| Moffatt and Paige - 1879 - 426 pages
...only one angle at a point, it may be expressed by one letter at that point, as the angle at E. 10. 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... | |
| Isaac Sharpless - Geometry - 1879 - 282 pages
...DB, BO. If there be but one angle at a point, as at E, it may be designated simply as the angle E. 8. When a straight line standing on another straight line makes the adjacent angles equal to each other, each of them is called a right angle, and the straight line which stands on the other is... | |
| Alfred Hiley - 1879 - 228 pages
...sides AB, AC, but upon the extent or opening between the lines. XI. When a straight line standing upon another straight line makes the adjacent angles equal to one another, each of them is called a right A angle ; and the straight line standing upon the other is called a perpendicular... | |
| T S. Taylor - 1880 - 152 pages
...FD C being an equilateral triangle). (/) .-. the angle DCF is equal to the angle ECF. and Syllogism. When a straight line, standing on another straight line, makes the adjacent angles equal, each of the angles is called a right angle (Euc. Def. 10). The straight line FC standing on the straight... | |
| Isaac Todhunter - Euclid's Elements - 1880 - 426 pages
...lines DB, CB is named the angle DBC, or CBD ; but if there be only one angle at a point, it may bs expressed by a letter placed at that point; as the angle at E. 10. When a straight line standingon another straight line, makes the adjacent angles equal to one another,... | |
| William Schofield Binns - 1881 - 214 pages
...straight lines to one another, meeting or cutting each other in a point, as (10) "When a straight lino 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... | |
| Marianne Nops - 1882 - 278 pages
...than a right angle, called acute (Lat. acutus, sharp). These are thus defined by Euclid : — 10. ' 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 - 1883 - 176 pages
...Z.6, etc., by the letters ; name two adjacent angles ; name also two vertically opposite angles. H 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 each of the lines is perpendicular to the other, or at right... | |
| Euclid, Isaac Todhunter - Euclid's Elements - 1883 - 428 pages
...lines DB, CB is named the angle DBG, or CBD ; but if there be only one angle at a point, it may be expressed by a letter placed at that point; as the angle at E. 10. When a straight line standing on another straight line, makes the adjacent angles equal to one... | |
| Stewart W. and co - 1884 - 272 pages
...but are not in the same straight line. An angle is named from three or one letters, as ABC or B. 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... | |
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