 Fig. 40, so that the two angles thus formed are equal, the lines are said to be perpendicular to each other and the angles formed are called right angles. An acute angle is less than a right angle, Fig.  Junior High School Mathematics - Page 124by Edson Homer Taylor, Fiske Allen - 1919 - 210 pagesFull view - About this book
 | Noble Heath - 1855 - 468 pages
...•When two straight lines cut each other, so as to make the four angles at the point of intersection all equal, the lines are said to be perpendicular to each other, and the angles are called right angles. Thus, the four angles, which the straight lines NS and WE make at the point... | |
 | Noble Heath - Arithmetic - 1856 - 472 pages
...two straight lines cut each N other, so as to make the four angles at the point of intersection all equal, the lines are said to be perpendicular to each other, and the angles are called right angles. WE Thus, the four angles, which the straight lines NS and WK make at the point... | |
 | Sir Norman Lockyer - Astronomy - 1874 - 332 pages
...extend its sides. FIO. 4. 27. When one straight line meets " another in such a way as to make the two adjacent angles equal, the lines are said to be perpendicular to each other, and p ° 1 the angles formed are called Right Angles. The angles N 0 P and NO Q, being equal, are right... | |
 | Sir Norman Lockyer - Astronomy - 1880 - 332 pages
...extend its sides. FIO. 4. 27. When one straight line meets " another in such a way as to make the two adjacent angles equal, the lines are said to be perpendicular...other, and the angles formed are called Right Angles. The angles N OP and NO Q, being equal, are right angles ; and the lines NO, PQ, are perpendicular to... | |
 | John Cresson Trautwine - Civil engineering - 1891 - 1034 pages
...and ab, meet in such a manner that the inclination on ale equal to the inclination onb, then the two lines are said to be perpendicular to each other; and the angles on a and о п Ь, are called rifpht angles; and are each measd by, or are equal to. 90°, or one-fourth... | |
 | John Tilden Prince - Arithmetic - 1894 - 246 pages
...direction. However far prolonged, they can never meet. When one line meets another line so as to make the adjacent angles equal, the lines are said to be perpendicular to each other. 9 A line may be drawn parallel to another line as previously shown, or by the following way : To draw... | |
 | John Cresson Trautwine - Civil engineering - 1894 - 1016 pages
...ab, meet in such a manner tliat the incli&'iiiou on ala equal to the inclination onb, then the two lines are said to be perpendicular to each other; and the angles on a and on Ь, are called rljçlit angles t and are each ineasd by, or areeqii.il 10. »X>, or one-fourth... | |
 | Adelia Roberts Hornbrook - Geometry - 1895 - 222 pages
...angles with two lines. NOTE. — When one line meets another so as to make two adjacent equal angles, the lines are said to be Perpendicular to each other and the angles are called Right Angles. 32. Make four right angles with two lines. 33. Make one right angle with two... | |
 | Samuel Wesley Baird - Arithmetic - 1897 - 204 pages
...called an Angle. When one straight line meets another straight line so as to form two equal angles, the lines are said to be Perpendicular to each other, and the angles thus formed are called Right Angles. When the angle is less than a right angle, it is called an Acute... | |
 | Wilbur Fisk Nichols - Arithmetic - 1903 - 328 pages
...and correct them with ruler and triangle. 3. Write : When one line meets another line so as to make the adjacent angles equal, the lines are said to be perpendicular to each other. 4. Draw two lines so as to form equal adjacent angles. Define perpendicular lines. 5. Draw a line perpendicular... | |
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