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Unformatted text preview: Section 4.1 Angles and Their Measure, p. 1 Section 4.1: Angles and Their Measure 1) Recognize and use the vocabulary of angles . Ray, angle, initial side, terminal side, vertex, standard position, positive angles, negative angles, quadrant, quadrantal angle. 2) Use degree measure . a. One degree, 1 , is 1/360 of a complete rotation around a circle. b. Types of angles: acute: < < 90 right: = 90 obtuse: 90 < < 180 straight: = 180 Section 4.1 Angles and Their Measure, p. 1 Section 4.1 Angles and Their Measure, p. 2 3) Draw angles in standard form . a. An angle is in standard form when the vertex of the angle is placed at the origin, the initial side is placed along the positive x-axis and the terminal side is found by rotating degrees counterclockwise for a positive angle and clockwise for a negative angle. b. Example 1 : Draw each angle in standard position: 1. 45 , 2. 225 3. -135 , 4. 405 4) Find coterminal angles ....
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