Prodromus of a practical treatise on the mathematical arts: containing directions for surveying and engineering (1838)
Eaton, Amos, 1776-1842 · Troy, N.Y., E. Gates; New York, Robinson, Pratt & co., [etc., etc.] · leaf 191
Ohtuse-angled triangle has one obtuse an-gle. Sec. 32. Acute-angled triangle has all three angles acute.If it has two equal sides, it should be called also Isos-celes triangle. If the three sides are equal, it is alsocalled Equilateral. Sec. 32. a c is the sine of the angle e. Sec. 33, article 3. … %/\ V The figured line is a line of chords. Sec. 33,^rV y article 4. Illustration of the principle that a tri- angle contains 180 degrees. Semi-circle l|~~ g i is the measure of 180°—angle a in it equals angle a in the triangle—e equals e—c equals c. Sec. 33, article 5. 17»
Surveying · Civil engineering
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