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Trigonometry Terms

TermDefinition
Trigonometry The study of the relations of sides and angles of triangles
Angle Determined by rotating a ray about its endpoint
Initial Side The starting position of a ray; POSITIVE x-axis
Terminal Side The position after the rotation
Vertex The common endpoint; origin
Co-Terminal Angles Angles that have the same initial side and the same terminal side Formula: Co-T = theta + n * 360 degrees Co-T = theta + n * 2pi
Radian The measure of the central angle, theta that intercepts arc, s, equal in length to the radius, r, of a circle Formula: theta = s/r
Arc Length The distance between two points along a circle Formula: s = central angle * radius *Central angle must be in RADIANS*
Cosecant Reciprocal of Sine
Secant Reciprocal of Cosine
Cotangent Reciprocal of Tangent
Reference Angle The acute (positive) angle, O', formed by the terminal side of O (theta) and the horizontal axis (Shortest path to the x-axis)
Unit Circle A circle with a radius of 1 unit
Quadrantal Angle An angle whose terminal side lies on an axis
Created by: chenhan001
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