Davies, Charles, 1798-1876 · New York and Chicago, A. S. Barnes and company · leaf 183
an arc is the perpendicular let fall from oneextremity of the arc on the diameter which passes throughthe other extremity. Thus, BD is the sine of the arc AB. 25. The cosine of an arc is the part of the diameter inter-cepted between the foot of the sine and centre. Thus, OB isthe cosine of the arc… … TRIGONOMETR V 183 Definitions. 27. The secant of an arc is ^,he line drawn from the centre of the circle through one extremity of the arc, and limited bj the tangent passing through the other extremity. Thus, 00is the secant of the arc AB. 28. The four lines, BD, OD, AC, OC, depend for theirvalues…
Geometry · Plane trigonometry
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