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Vocabulary in sections 4.1-4.4. Trigonometry- a Greek word that means measurement of triangles Initial side- A ray that is the starting position of the angle Terminal side- the ray of the angle that rotates about the initial side Vertex- The point at the end of the two rays where the angles meets Standard position- when a angles’ initial side is located on the x-axis Positive angles- angles that rotate counter clockwise Negative angles- angles that rotate clockwise Central angle- if the vertex of an angle is located on the origin Acute angles- an angle with a degree of less than 90 degrees Obtuse angles- and angles that is between 90 and 180 degrees Complementary angles- two angles who's sum is 90 degrees Supplementary angles- two angles who's sum is 180 degrees Trigonometric functions- the six trigonometric functions are sine, cosine, tangent, cosecant, secant, and cotangent Periodic- functions that behave in a repetitive manner Opposite Side- leg of a right triangle that is opposite of the angle Adjacent Side- leg of a right triangle that is adjacent to the angle Hypotenuse- Side of a triangle that is opposite the right angle Angle of elevation- angle from the horizontal upward to an object Angle of depression- angles that lie below the horizontal and downward towards an object Reference angle- any acute angle formed by the terminal side of theta and the horizontal axis
