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 159
r within it. The double sign without the rad-ical indicates two inverted symmetrical positions of the point B,one above and the other below the horizontal plane of observa-tion. PROBLEM XL From a station P there can he seen three objects, in the samehorizontal plane, A, B, and 0, whose distances… … GEOMETRICAL SOLUTION. On both sides of the line AC, as a chord, describe segmentsof a circle, as APiEP4C, AP3DP2C, capable of containing anglesequal to 33° 45 (Geometry, B. III., Prop. XV.).
Plane trigonometry · Surveying
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