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Warm Up

Preview. Warm Up. California Standards. Lesson Presentation. C. AB , BA , and AC. A. B. Warm Up 1. Draw two points. Label one point A and the other point B . 2. Draw a line through points A and B . 3. Draw a ray with A as an endpoint and C as a point on the ray.

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Warm Up

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  1. Preview Warm Up California Standards Lesson Presentation

  2. C AB, BA, and AC A B Warm Up 1.Draw two points. Label one point A and the other point B. 2. Draw a line through points A and B. 3. Draw a ray with A as an endpoint and C as a point on the ray. 4. Name all the rays in your drawing.

  3. California Standards Preparation for MG2.1 Identify angles as vertical, adjacent, complementary, or supplementary and provide descriptions of these terms. Also covered: Prep for MG2.3

  4. Objective: You will learn how to (YWLHT) name and classify angles.

  5. Vocabulary angle vertex acute angle right angle obtuse angle straight angle

  6. An angle is formed by two rays with a common endpoint, called the vertex. An angle can be named by its vertex or by its vertex and a point from each ray. The middle point in the name should always be the vertex. Angles are measured in degrees. Use the symbol °to show degrees.

  7. F H G Reading Math mFGH is read “the measure of angle FGH.”

  8. Reading Math Right angles are usually marked with a symbol. An acute angle measures less than 90°. A right angle measures exactly 90°.

  9. An obtuse angle measures more than 90° and less than 180°. A straight angle measures exactly 180°.

  10. Example 1: Classifying Angles Classify each angle as acute, right, obtuse, or straight. A. B. The angle measures exactly 90°, so it is a right angle. The angle measures less than 90°, so it is an acute angle.

  11. Check It Out! Example 2 Classify each angle as acute, right, obtuse, or straight. A. B. The angle measures exactly 180°, so it is a straight angle. The angle measures less than 90°, so it is an acute angle.

  12. Additional Example 3: Application A welder used this piece of metal on his project. Classify X, Y, and Z. X right The angle is marked as a right angle. Y obtuse The angle measures more than 90° and less than 180°. Z acute The angle measures less than 90°.

  13. Check It Out! Example 4 A metal jeweler used this piece of metal on her project. Classify A, B, and D. A D B C A obtuse The angle measures more than 90° and less than 180°. The angle measures less than 90°. B acute D right The angle is marked as a right angle.

  14. Home Learning On-Line Tutoring Geo-match-try Geo-fit Geo-Terms Geo-Vocab Shape Quiz Angle Tangle

  15. Lesson Quiz Use a protractor to draw an angle with the given measure. Tell what type of angle it is. 1. 140° 2. 20° 3. Draw a right angle. 4. Is the angle shown closer to 30° or 120°? Check student drawings; obtuse Check student drawings: acute 30°

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