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Geometry

Lesson 1-4 Angle Measure Mr. Elliott. Geometry. Objectives. TLW measure and classify angles TLW identify and use congruent angles and the bisector of an angle. Exploring Angles. Ray : part of a line that has one endpoint and extends indefinitely in one direction. B. Ray AB. A.

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Geometry

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  1. Lesson 1-4 Angle Measure Mr. Elliott Geometry

  2. Objectives • TLW measure and classify angles • TLW identify and use congruent angles and the bisector of an angle

  3. Exploring Angles • Ray: part of a line that has one endpoint and extends indefinitely in one direction B Ray AB A

  4. Rays, like points, can be collinear l Y X Z -XY and XZ are collinear rays as well as Opposite rays. -X is the common endpoint for the rays

  5. Angle: formed by two noncollinear rays that have a common endpoint Vertex P Q Side PQ 2 P Side PR R RPQ, QPR, 2 P,

  6. E A B C F E is in the interior of the angle F is in the exterior A, B, and C are on the angle

  7. Classifying Angles A B Acute Angle Right Angle C Obtuse Angle

  8. Congruent Angles Angles that have the same measure are said to be Congruent P X 35 35 Y Q Z

  9. Angle Bisector • Angle Bisector: A ray that divides an angle into two congruent angles C B 25 25 A D AB is an angle bisector,

  10. Additional Tips • Angles are measured in degrees. • Opposite rays are also known as a straight angle which measures 180. • You can name an angle by a single letter only when there is one angle at that vertex

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