 | William Alexander Myers - Circle-squaring - 1873 - 238 pages
...produced would form two concentric circles ; *that is, having a common center, as at F. 14. When a straight line 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... | |
 | Henry Major - Student teachers - 1873 - 588 pages
...line. An angle is named from three or one 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 a right angle ; and the straight line which stands on the other is _ called a... | |
 | John Clement P. Aldous - 1874 - 104 pages
...measures are of the same length. 2 There is one well-known angle by which angles may be measured. DBF. When one straight line standing on another straight...equal to one another, each of these angles is called a Bight Angle. Now all right angles are equal to one another. So that any angle may be measured by them.... | |
 | Francis Cuthbertson - Euclid's Elements - 1874 - 400 pages
.... AS ACE, BCE are equal in all respects, and.-. AE is =BE; (i. i) ( 14 ) RIGHT ANGLES. DEFINITION. When one straight line, standing on another straight...the adjacent angles equal to one another, each of them is called a right angle; and the straight line which stands upon the other is said to be perpendicular... | |
 | Euclides - 1874 - 120 pages
...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,...the adjacent angles equal to one another, each of the angles is called a right angle [Def. 10] ; therefore each of the angles DCF, ECF is a right angle.... | |
 | William Alexander Myers - Circle-squaring - 1874 - 207 pages
...if produced would form two concentric circles ; that is, having a common center, as at F. 14. When a straight line 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... | |
 | Edward Atkins - 1874 - 426 pages
...angle at any given point, it may be expressed by the letter at that point, as the angle 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... | |
 | George E. Webster - 1874 - 136 pages
...inclination of two straight lines whicli meet together, but do not form the same straight line. 4- When a straight line standing on another straight line makes the adjacent angles equal to one another, thia line is said to be at right angles to the line on which it stands. A Right Angle equals 90°,... | |
 | Euclides - 1874 - 342 pages
...one angle at a point, it may be expressed by the 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 each other, each of these angles is called a right angle ; and the straight line which stands on the... | |
 | Henry Lewis (M.A.) - Measurement - 1875 - 104 pages
...explanation of the term "right angle," but it is, perhaps, a little too difficult for beginners: — When a straight line standing on another straight line makes...another, each of these angles is called a right angle. An acute angle is less than a right angle, as ABD, DEE. An obtuse angle is greater than a right angle,... | |
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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. 
