The Boston school compendium of natural and experimental philosophy .. (1837)
Parker, Richard Green, 1798-1869 · Boston : Marsh, Capen & Lyon · leaf 43
formed by * As this book may fall into the hands of some who are unacquainted with themeaning of angle, perpendicular, the divisions of a circle, &c. a few explanation!are here subjoined. 1. An angle is the opening made by two lines which meet together in a point.The size of the angle depends… … 6t The straight lines drawn from the centre to the circumference are called radii. [Thesingu-lar number of this word is radius.] Thus, in Fig.6, the lines CD, CO,CR, and CA,are radii. 4. The lines drawn through the centre, and ter-minating in bolh ends at the circumference, arecalled diameters.…
Physics
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