The Artisan, or, Mechanic's instructor : containing a popular, comprehensive and systematic view of the following sciences ... also biographical notices of eminent scientific men, enriched by portraits : with many interesting and valuable articles relating to the mechanical and useful arts : the whole intended as a companion to the institutes (1825)
Carey, George G · London : Printed for William Cole · leaf 497
ame manner the angles B A D, D A B, D C B, may be shown semicircle; and the angles in it RAC, R E C are equal, by the first case : For to be equal to two right angles. There- the same reason, because C R E D is fore, the opposite angles, &c. Q. E. D. PROPOSITION XXIII. THEOREM.—Upon the same… … E Vol. II.— No. 30.