Schmall, Charles Nelson. [from old catalog] · New York, D. Van Nostrand company · leaf 328
Fig. 172. The Graph of the equations, b cos 2 n-a i = ± b sin 2 7T~] for two values of b, repcesentingthe plan of the spirals of a doublethreaded screw of pitch a. … The Elliptic Compass. APPENDIX Note 1. — Area of a polygon in terms of the co-ordinates of its ver-tices (.Ti, 2/1), (0^2, 1/2) 1 etc. Case I. Origin witliin the polygon. Area ABODE = A OAB + A OBO + A OOD + etc. = i 5fe?/i - x^y^ + [x^yo - .T22/3] + etc.}. (a!i;i/i)^
Geometry, Analytic
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