Davies, Charles, 1798-1876 · New York and Chicago, A. S. Barnes and company · leaf 19
, CD, CE, CF, &c,drawn on the same side of AB, are equalto two right angles : for, they will bemeasured by a semicircumference. Cor. 3. If DC meets two lines CB, CA, making DCBplus DC A equal to two right angles, ACB will form onestraight line. Cor. 4. Hence, also, all the angleswhich can be…
Geometry · Plane trigonometry
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
![An illustration from Works. Popular edition.] 2 series (1886)](https://img.insideoutlibrary.com/img/200/bl-bl_003191336_9-384-1.webp)
