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5.1_bzat4e

# 5.1_bzat4e - Section5.1 Angles and Their Measure Angles A...

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Section5.1 Angles and Their Measure

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Angles
A ray is a part of a line that has only one endpoint and extends forever in the opposite direction. An angle is formed by two rays that have a common endpoint. One ray is called the initial side and the other the terminal side. A rotating ray is often a useful way to think about angles. The endpoint of an angle's initial side and terminal side is the vertex of the angle. An angle is in standard position if 1. its vertex is at the origin of a rectangular coordinate system 2. its initial side lies along the positive x-axis

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Positive angles are generated by counterclockwise rotation. Thus, angle is positive. Negative angles are generated by clockwise rotation as you see angle in the diagram. An angle is called quadran α θ tal if its terminal side lies on the x-axis or the y-axis. If a standard angle has a terminal side that lies in a quadrant then we say that the angle lies in that quadrant. Angle lies in quadrant α II. Angle lies in quadrant III.
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5.1_bzat4e - Section5.1 Angles and Their Measure Angles A...

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