Trigonometric Reference Triangles/Angles Drawn in Quadrants

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Trigonometric reference triangles/angles drawn for reference angel in quadrants I and II. This illustration could be used to find trig ratios.

Keywords

tangent, angle, triangles, degrees, Sine, Tan, special right triangle, trigonometry, ratios, relationships, reference angles, sin, cos, cosine

Galleries

Trigonometry: Triangles

Source

Claude Irwin Palmer Library of Practical Electricity: Practical Mathematics For Home Study (New York: McGraw-Hill Book Company, Inc., 1919) 412

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