A treatise on surveying and navigation: uniting the theoretical, the practical, and the educational features of these subjects (1852)
Robinson, Horatio N[elson], 1806-1867. [from old catalog] · Cincinnati, J. Ernst · leaf 53
e angle FIG, is a right angle ; so is BIN; and, from thesetwo equals take away the common angle IIIL, leaving the angleFIH= GIN. The angles at H and N, are right angles ; therefore,the A FBI, is equiangular, and similar to the A GUV, and, ofcourse, to the A GD 0; and the side III, is homologous to… … PLANE TRIGONOMETRY. 49 cos.a sin.5 That is, JR:cos.a=sm.b:FIT, or FE= EAlso, GD:GO=GI:GJST mi L • t» 7 •vTtr /vnr COS.a COS.6 That is, R: cos.a=cos.b : GN, or GN= Jti Also, GD:DO=FI:IH . . r sin.a sin.6That is, -« : sm.a=sm.o : 7iz, or .///= — By adding the first and second of these equations, we…
Surveying · Navigation
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