Elements of surveying and navigation : with a description of the instruments and the necessary tables (1847)
Davies, Charles, 1798-1876 · New York : A.S. Barnes & Co. · leaf 41
by a line drawn through theother extremity and the centre of the circle. Thus, AC is thetangent of the arc AB. 47. The secant of an arc is the line drawn from the centreof the circle through one extremity of the arc, and limited bythe tangent passing through the other extremity. Thus, OCis the… … 49. If ABE be equal to a quad-rant, or 90°, then EB Avill be thecomplement of AB. Let the linesET and IB be drawn perpendicularto OE. Then, ET, the tangent of EB, is called the cotangent of AB; IB, the sine of EB, is equal to the cosine of AB; OT, the secant of EB, is called the cosecant of AB, In…
Surveying · Navigation
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