Davies, Charles, 1798-1876 · New York and Chicago, A. S. Barnes and company · leaf 43
*Note. When reference is made from one theorem to unother, in thesame Book, the number of tne theorem referred to is alone given • butwhen the theorem referre 1 to is found ir a preceding Book, the number of the Book is also g;ven.4* 42 G E 0 M £ T R V Of the Circle. … other, each to each: viz. AC equal toCB, being radii, AD equal to DB, byhypothesis, and CD common: hence,the corresponding angles are equal(Hook I. Th, viii): that is, the angleCD A equal to CDB, and the angleACD equal to the angle DCB. But, since the angle CD A is equalto the angle CDB, the radius…
Geometry · Plane trigonometry
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