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Trigonometry The science of studying angle measure r e T a n mi The measure of an angle is the amount of rotation required to rotate one side, called the initial side, to the other side, called the terminal side. e d i ls Angle: t wo rays with same initial point Ini t ia l si de An angle at standard position: if its vertex is at the origin of the rectangular coordinate system and its initial side lies along the positive x-axis Negative: since the angle rotated clockwise Positive: since the angle rotated counterclockwise Degree Measure A Circle can be divided into 3600 Radian Measure ∏ 2 ∏ 2∏ 3∏ 2 Examples: Convert degree to radian measure Convert the following Radian Measure to Degree 2∏ =1200 3 5∏ =1500 6 ∏ 6 =300 5∏ =3000 3 Convert the following Degree to Radian Measure 2100 7∏ 6 1350 3∏ 4 600 ∏ 3 2250 5∏ 4