Unit Circle Trigonometry standard position x - UH
Math 1330 - Section 4.3 Unit Circle Trigonometry An angle is in standard position if its vertex is at the origin and its initial side is along the positive x axis. Positive angles are measured counterclockwise from the initial side. Negative angles are measured clockwise. We will typically use the Greek letter to denote an angle.
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Example 1: Sketch each angle in standard position. a. 240?
b. -150?
c.
4 3
d.
5 4
3
COTERMINAL ANGLES Angles that have the same terminal side are called coterminal angles. Measures of coterminal angles differ by a multiple of 360? if measured in degrees or by a multiple of 2 if measured in radians.
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Example 2: Find two angles, one positive and one negative that are coterminal with each angle.
a. 55?
b.
4
5
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