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## Angle Measurement Angles are measured in degrees and radians. ### Sexagesimal System (Degree Measure): * The unit of measurement of an angle is a degree. * One complete rotation is 360 degrees. ### Co-Terminal Angles * Angles having the same initial and terminal rays but different measures...

## Angle Measurement Angles are measured in degrees and radians. ### Sexagesimal System (Degree Measure): * The unit of measurement of an angle is a degree. * One complete rotation is 360 degrees. ### Co-Terminal Angles * Angles having the same initial and terminal rays but different measures are called Co-terminal angles. * The difference between the measures of two co-terminal angles is an integral multiple of 360°. ### Quadrantal Angles * A directed angle is called a quadrantal angle if its terminal ray lies along the x-axis or y-axis. ### Angle in a Quadrant * A directed angle is said to be in the first, second, or third quadrant, based on where its terminal ray lies. ### Measuring Angles * The amount of rotation from the initial ray OA to the terminal ray OB measures angle AOB. * Angles can be measured in two systems: sexagesimal (degrees) and circular (radians).