A treatise on surveying and navigation: uniting the theoretical, practical, and educational features of these subjects (1857)
Robinson, Horatio N[elson], 1806-1867. [from old catalog] · Cincinnati, J. Ernst; Toledo, Anderson, Burr, & co. · leaf 56
PLANE TRIGONOMETRY. 53 PROPOSITION 4. In any triangle, the sines of the angles are to one another as thesides opposite to them. Let ABC be any tri-angle. From the pointsA and B, as centers, withany radius, describe thearcs measuring these an-gles, and draw^a, CD,and mn, perpendicular to AB. Then, .…
Surveying · Navigation
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