# Triangles and Sectors in Quadrant I

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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.

### Keywords

sector, tangent, angle, triangles, Sine, Tan, acute, trigonometry, sin, cos, cosine, trigonometric, trig functions, reference, quadrant 1### Galleries

Trigonometry: Triangles### 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

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