Reference Angles/Triangles Formed by Angles in Quadrants
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Lines drawn to horizontal to form triangle ratios (reference triangles, angles).
Keywords
triangles, angles, trigonometry, quadrants, trigonometric angle, reference triangle, reference angle, trig ratiosGalleries
Trigonometry: AnglesSource
Claude Irwin Palmer Library of Practical Electricity: Practical Mathematics For Home Study (New York: McGraw-Hill Book Company, Inc., 1919) 405
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