8), is supplemental to the angle A B D, and the angle A. B D supplemental to the angle A B C. A vertical angle is formed by the production of both its sides; thus in Fig. 9, if the sides of the angle 1) E B are produced to A and C respectively, then D E B, A E C, are called vertical angles, and ... of the circle; the describing line its radius, and the boundary traced by the remote end of that line its circumference;anbsp;...
|Title||:||The Circle of the Mechanical Arts; Containing Practical Treatises on the Various Manual Arts, Trades, and Manufactures. 2. Ed. -London, Rees 1815|