Geodaesia : or, The art of surveying and measuring land made easy (1768)
Love, John, fl. 1688, Clark, Samuel · London : Printed for J. Rivington · leaf 199
Q g two oppofite angles 70 degrees 5 J43 934 12,920377to the tangent of half their difference 50 degr. 4 min. >°77I44 Which 50°. 4. added to the half fum of the twounknown angles, viz. 70° gives 120°. 4. for thequantity of the angle at B; but taken from 70,leaves 19°. 56. the angle at C, CASE… … You muft divide your oblique triangle into tworight-angled triangles, thus: In Trigonometry. In the triangle ABCThe fide A C is The fide A BThe fide 6 C The fum of the two fides AB, BCTheir difference As the log. of the fide A C 50is to the log. of the fum of the 7other two (ides 56 S So is their…
Surveying
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