The normal elementary geometry : embracing a brief treatise on mensuration and trigonometry : designed for academies, seminaries, high schools, normal schools, and advanced classes in common schools (1884)
Brooks, Edward, 1831-1912 · Philadelphia : Christopher Sower Co. · leaf 234
e;all lines estimated downward from it are negative. 2. All lines estimated from the vertical diameter towards the right arepositive ; all lines estimated toward the left are negative. Thus, the sines NP and WP arepositive, while NP and NPare negative; so also the cosines OPand OP are positive,… … 38 ANALYTICAL TRIGONOMETRY. 1. The Sine is positive in the first and second quadrants, beingmeasured above, and negative in the third and/ourtA quadrants. 2. The Cosine is positive in theirs* and fourth quadrants, andnegative in the second and third quadrants. 3. The Tangent is positive in the…
Geometry · Plane trigonometry
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