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Triangles and Sectors in Quadrant I
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Description: Illustration of an angle &alpha with the vertex at the center, O, of a circle with radius OB. AC and BD are perpendicular to OB and join B with C. The are of the triangle OBC is less than the are of the sector OBC, and the sector OBC is less than the triangle OBD.
Source: George N. Bauer, PH.D. and W.E. Brooke, C.E., M.A. Plane And Spherical Trigonometry (Boston: D.C. Heath & Co., 1917) 121
Keywords: angle, trigonometry, trigonometric, triangles, trig functions, sine, cosine, tangent, sin, cos, tan, reference, acute, quadrant 1, sector
Copyright: 2009, Florida Center for Instructional Technology. See license.
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