Plane trigonometry, and its application to mensuration and land surveying. Accompanied with all the necessary logarithmic and trigonometric tables (1852)
Perkins, George R. (George Roberts), 1812-1876 · New York, D. Appleton · leaf 143
oint either within or without the perimeterof afield, to draw a line so as to cut off a given area. CASE I. When the point is within the field, as at P. Let ABCDFGH be thesame field as in the pre-ceding problems. Produce the sides BCand FD until they meet atK Through P draw MPNparallel to BK, and… … § 83.] SURVEYING. 133 it will be the line required: all of which is obvious from thepreceding Lemma. CALCULATION. As an example, suppose the bearing of CP to be S. 2° W.,and equal to 3*75 chains, and that the area to be cut off is 2 acres. Triangle CPD gives CD = 5-03 ; CP = 3*75 ; and the…
Plane trigonometry · Surveying
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