A system of geometry and trigonometry, with a treatise on surveying; in which the principles of rectangular surveying, without plotting, are explained (1835)
Flint, Abel, 1765-1825, Gillet, George · Hartford, Belknap & Hamersley; New York, Cooke & Co. · leaf 14
Fig. 12. 35. A right angled triangle has oneright angle. Fig. 12. 36. An obtuse angled triangle has oneobtuse angle. 37. An acute angled triangle has all its angles acuteFig. 9, or 10. 38. Acute and obtuse angled triangles, are called obliqueangled triangles, or simply oblique triangles ; in which… … 14 GEOMETRY. Note. The three angles of every triangle being addedtogether will amount to 180 degrees ; consequently thetwo acute angles of a right angled triangle amount to90 degrees, the right angle being also 90. 40. The perpendicular height of a tri-angle is a line drawn from one of the an-gles…
Surveying
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