Articles liés à Elements of Trigonometry: Plane and Spherical (1898)
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Présentation de l'éditeur
In Trigonometry the size of an angle is measured by the amount one side of the angle has revolved from the position of the other side to reach its final position. Thus, if the hand of a clock makes one-fourth of a revolution, the angle through which it turns is one right angle; if it makes one-half a revolution, the angle is two right angles; if one revolution, the angle is four right angles; if one and one-half revolutions, the angle is six right angles, etc. B-t5) FIG. 3T he amount the side OB has rotated from OA to reach its final position may or may not be equal to the inclination of the lines. In Fig. i it is equal to this inclination ;in Fig. 4it is not. Two angles mny have the same sides and yet be different. In Fig.
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