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Angle Measure

Angle Measure. Section 1-4. Vocabulary. Degree Ray Label. Naming a ray – AM or AP. Opposite Rays. Opposite rays are two rays with a common endpoint that form a line. R S T. The opposite rays are SR and ST. Angle.

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Angle Measure

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  1. Angle Measure Section 1-4

  2. Vocabulary • Degree • Ray • Label Naming a ray – AM or AP

  3. Opposite Rays • Opposite rays are two rays with a common endpoint that form a line. R S T The opposite rays are SR and ST.

  4. Angle • 2 noncollinear rays that share a common endpoint. Angle Name R, SRT, TRS, or 1

  5. Example 1 Name all of the angles in the diagram below RTQ, QTS, STR, 1, 2

  6. The measureof an angle is usually given in degrees. Since there are 360° in a circle, one degreeis of a circle. You will use a protractor to find the measures of angles. Measuring Angles

  7. Example 2 - Find the measure of each angle. Then classify each as acute, right, or obtuse. A. WXV mWXV = 30° WXV is acute. B. ZXW mZXW = |130° - 30°| = 100° ZXW = is obtuse.

  8. Congruent Angles Congruent angles are angles that have the same measure.

  9. An angle bisector is a ray that divides an angle into two congruent angles. JK bisects LJM; thus LJKKJM.

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