A treatise on surveying ; in which the theory and practice are fully explained (1860)
Alsop, Samuel · Philadelphia, E. C. & J. Biddle & co. · leaf 73
G — EFC = ABC — EFC = £ (ABC — ACB). Now, since the angle ECF is an angle in a semicircle, it is a right angle.Therefore, if with the centre F and radius FC an arc be described, EC andCG will be the tangents of EFC and CFG, or of the half sum and half dif-ference of ABC and ACB. But (2.6) EB : BF… … Sec. IV.] NUMERICAL SOLUTION OF TRIANGLES. 71 As AB + AC 1020 A.C. 6.991400 : AB-AC 34 1.531479 C+B::tan. g 71° 5 305° 33 29 10.465290 C-B : tan. —-— 2 8.988169 C 76° 38 59 B 65° 32 1 As sin. C 76° 38 59 A.C. 0.011897 : sin. A 37° 49 9.787557 ::AB 527 2.721811 : BC 332.10 2.521265 Ex. 2. In the…
Surveying
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