Hale, Joseph W. L. (Joseph Woodwell Ledwidge), 1886- · New York [etc.] McGraw-Hill book company · leaf 174
Fig. 112. triangle shown in Fig. Ill the sides always have a ratioof 1, 2, and \/3 as given. You can prove this for your-selves by carefully constructing such a triangle on thedrawing board and measuring the lengths of the sides.Therefore from our definition of the sine, cosine, etc., ofan angle we…
Mechanics, Applied
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