 | Euclides, Frederick Burn Harvey - 1880 - 178 sider
...vertically opposite angles ; as also are the angles AED and BEO. 10. When a straight line standing upon another straight line makes the adjacent angles equal...other, each of these angles is called a RIGHT ANGLE, and each straight line is said to be PERPENDICULAR to the other. D Thus each of the angles ABD and... | |
 | Isaac Todhunter - 1880 - 426 sider
...[Definition 24. therefore the angle DCF is equal to the angle ECF; [I. 8. and they are adjacent angles. But 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 ; [Definition 10. therefore each of the angles... | |
 | T S. Taylor - 1880 - 152 sider
...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... | |
 | Marianne Nops - 1882 - 278 sider
...smaller than a right angle, called acute (Lat. acutus, sharp). These are thus defined by Euclid : — 10. ' 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... | |
 | Euclid, Isaac Todhunter - 1883 - 428 sider
...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 another, each of the angles is called a right angle; and the straight line which stands on the... | |
 | Euclides - 1883 - 176 sider
...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 line makes the adjacent angles equal to one another, each of the angles is called a right angle ; and each of the lines is perpendicular to... | |
 | Euclides - 1884 - 182 sider
...angle in as many different ways as you can, and say how many. u •"- .° *• 6. KINDS OF ANGLES. 10. When a straight line standing on another straight...other, each of these angles is called a right angle; and the straight line which stands on the other is called a perpendicular to it. 11. An obtuse angle... | |
 | Euclides - 1884 - 214 sider
...are together equal to two right angles. Axiom 1. Therefore, the angles which &o. QE Ti. Definition 10. When a straight line standing on another straight line makes the adjacent angles equal to one another, each of these angles is called a right angle. Proposition XL A straight -line may be drawn... | |
 | Euclides - 1884 - 94 sider
...equal to the base ; therefore the angle is equal to the angle ; and these are adjacent angles. But when a straight line standing on another straight line, makes the adjacent angles equal to one another, each of them is a right angle, and the straight line which stands upon the other is called... | |
 | Stewart W. and co - 1884 - 272 sider
...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 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... | |
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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. 
