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. Elements of Geometry and Conic Sections - Page 10by Elias Loomis - 1849 - 226 pagesFull view - About this book
| Āryabhaṭa - 1878
...subjoined B is an angle and is thus expressed : " Angle AB 0." A BC XVI. 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 ; and the straight line which stands on the other is called a... | |
| Alfred Hiley - 1879 - 230 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 to it. Thus if AB,... | |
| Euclides - 1879
...which the lines meet is often called the vertex of the angle.] 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 ; and the straight line which stands on the other is called a... | |
| Moffatt and Paige - 1879
...may be expressed by one letter 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 other is called a perpendicular... | |
| Isaac Sharpless - Geometry - 1879 - 282 pages
...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 called a perpendicular. 9. An obtuse 1 angle is one that is greater than a right... | |
| T S. Taylor - 1880 - 152 pages
...B.) A D DEFINITION OF RIGHT ANGLES. JTigr.J. Euc. Def. io.) — 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 -A. -0 .*... | |
| Isaac Todhunter - Euclid's Elements - 1880 - 400 pages
...equal to the angle CHG ; [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, and the straight line which stands on the other is called a perpendicular... | |
| Thomas Newton Andrews - Geometry - 1881 - 160 pages
...falls upon the straight line AB, and makes ftigfif flight the angles on either side of it A/tgle Anq-/e **equal to one another, each of ^ them is called a right angle, and the** line CD is said to be perpendicular to the line A B. a Fig. 1. K Drawing Board 5_ ^ B I We read the... | |
| Marianne Nops - 1882
...(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 other is called a perpendicular... | |
| Euclides - 1883 - 96 pages
...(/. 8), and .-. L DCF = L ECF, 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** the angles is called a right angle. .-. CF is at right angles to AB, and is drawn from the given point... | |
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