Hale, Joseph W. L. (Joseph Woodwell Ledwidge), 1886- · New York [etc.] McGraw-Hill book company · leaf 172
is drawn with aradius (one-half the diameter)equal to 1 in. CD is a horizon-tal and EF a vertical diameter.The radius OA makes any con-venient angle. ^^a^ with ra-dius OC and from point A lineA5 is drawn at right angles to line OC making the an-gle at B equal to 90° and giving the right triangle… … a = 1 with OA = 1 in.). Therefore sineor side AB. Hence the sine of a is equal to the length of the line AB. In the figure, AB measures.5 of an inch. Therefore sine a = .5. Notice that ifangle a were smaller the line AB would be smaller, thatis, sine a would be smaller. If angle a were larger,…
Mechanics, Applied
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