. The prospector's field-book and guide in the search for and the easy determination of ores and other useful minerals. one-half A B = 45 ft., and we have 6750 sq. ft., fori CD is composed of two right-angled triangles,A C B and A B D, as in the previous example. Or, when the triangle has an acute angle at A,Fig. 29, thus: Treat precisely as in Fig. 28, onlyletting the perpendicular fall from D upon A C,that is, invert the triangle. The cases wherein the sides are more than three 74 PROSPECTOR S FIELD-BOOK AND GUIDE. are treated by resolving all such areas into right-angled triangles, thus : I
. The prospector's field-book and guide in the search for and the easy determination of ores and other useful minerals. one-half A B = 45 ft., and we have 6750 sq. ft., fori CD is composed of two right-angled triangles,A C B and A B D, as in the previous example. Or, when the triangle has an acute angle at A,Fig. 29, thus: Treat precisely as in Fig. 28, onlyletting the perpendicular fall from D upon A C,that is, invert the triangle. The cases wherein the sides are more than three 74 PROSPECTOR S FIELD-BOOK AND GUIDE. are treated by resolving all such areas into right-angled triangles, thus : In Fig. 30, the area, A C D B may be resolvedinto two triangles, A C B and C D B, of which A B Fig. is the base of the one and C B that of the Fig. 31, the area, A C D B E K, may be re-solved into the four triangles, AC D, A D B, ABEand A E K. The perpendiculars of Fig. 30 are
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectprospec, bookyear1903
