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 161
and ACH by £, we shall have, Chap. IV., CaseELL, equation (1), tang- 9. = fj^XR x cotan * ^n^ ^ Since half the sum of these angles is 90°—^ {p—^\ weshall have 90°—\ (p—n)—q for the angle ACH, the comple- 150 SURVEYING. [CHAP. XI. ment of which is ^ (p—n) + q ; hence, applying Theorem I. ofOblique…
Plane trigonometry · Surveying
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![An illustration from Divina proportione : opera a tutti glingegni perspicaci e curiosi necessaria oue ciascun studioso di philosophia: prospettiua pictura sculptura: architectura: musica: e altre mathematice: suavissima: sotile: e admirabile doctrina consequira: e delecterassi: co[n] varie questione de secretissima scientia (1509)](https://img.insideoutlibrary.com/img/200/ia-divinaproportion00paci-102-236.webp)
![An illustration from Divina proportione : opera a tutti glingegni perspicaci e curiosi necessaria oue ciascun studioso di philosophia: prospettiua pictura sculptura: architectura: musica: e altre mathematice: suavissima: sotile: e admirabile doctrina consequira: e delecterassi: co[n] varie questione de secretissima scientia (1509)](https://img.insideoutlibrary.com/img/200/ia-divinaproportion00paci-94-180.webp)
