 | Euclid, Isaac Todhunter - Euclid's Elements - 1867 - 426 pages
...BFE. [I. 8. 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 ; [I. Definition 10. therefore each of the angles AFE, BFE is a right angle. Therefore the straight... | |
 | Euclid, Isaac Todhunter - Euclid's Elements - 1867 - 424 pages
...BDG. [I. 8. 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 ; [I. Definition 10. therefore the angle BDG is a right angle. But the angle BDF is also a right angle.... | |
 | Robert Potts - 1868 - 434 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...stands on the other is called a perpendicular to it. XL An obtuse angle is that which is greater than a right angle. XII. An acute angle is that which is... | |
 | E. M. Reynolds - Geometry - 1868 - 172 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 which stands on the other is said to be perpendicular to it. We acquire a clear idea of'the magnitude of an angle by supposing it... | |
 | Isaac Todhunter - Measurement - 1869 - 312 pages
...angle ; and so on. 8. When a straight line standing on another straight line makes the adjacent angles equal to one another, each of the angles is called...stands on the other is called a perpendicular to it. Thus, in the figure, if the angle ABC is equal to the angle ABD each of them is a right angle, and... | |
 | Euclides - 1871 - 136 pages
...IX. When a straight line (as AS) meeting another straight line (as CD) makes the A adjacent angles equal to one another, each of the angles is called a RIGHT ANGLE; and each line is said to be a PEEPENDICULAB to the other. c X. An OBTUSE ANGLE is one which is greater... | |
 | Walter Smith - Blackboard drawing - 1872 - 166 pages
...Three Lines: Angles and Triangles. DIVISION a. ANGLES. DEFINITIONS. — No. 1. A right angle. No. 2. An obtuse angle is that which is greater than a right angle. No. 3. An acute angle is that which is less than a risjht OO angle. The dotted line shows a right angle... | |
 | Henry Major - Student teachers - 1873 - 588 pages
...letters, as ABC or B. X. When a straight line standing oil another straight line makes the adjacent angles equal to one another, each of the angles is called...and the straight line which stands on the other is _ called a perpendicular to it. XI. An obtuse angle is greater than a right angle. XII. An acute angle... | |
 | William Alexander Myers - Circle-squaring - 1873 - 238 pages
...standing on another straight line makes the adjacent angles equal to one another, each of the angles is a right angle, and the straight line which stands on the other is called a perpendicular to it; IKL arc perpendiculars to the line GH. PLATE 1. DEFINITIONS OF LINES AND ANGLES AA B H ,r ' V X £... | |
 | Euclides - 1874 - 342 pages
...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...angle is that which is greater than a right angle. / 18. An acute angle is that which is less than a right angle. 13. A term or boundary is the extremity... | |
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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. 
