2. Welcome to Interactive Chalkboard Glencoe Geometry Interactive Chalkboard Copyright © by The McGraw-Hill Companies, Inc. Developed by FSCreations, Inc., Cincinnati, Ohio 45202 Send all inquiries to: GLENCOE DIVISION Glencoe/McGraw-Hill 8787 Orion Place Columbus, Ohio 43240

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4. Contents Lesson 1-1Points, Lines, and Planes Lesson 1-2Linear Measure and Precision Lesson 1-3Distance and Midpoints Lesson 1-4Angle Measure Lesson 1-5Angle Relationships Lesson 1-6Polygons

5. Lesson 4 Contents OBJECTIVE: To measure and classify angles (2.3.8C) (M8.C.1.) Example 1Angles and Their Parts Example 2Measure and Classify Angles

6. Example 4-1a Name all angles that have B as a vertex. Answer:  5,  6,  7, and  ABG

7. Example 4-1b Name the sides of  5. Answer: and or are the sides of  5.

8. Example 4-1c Write another name for  6. Answer:  EBD,  FBD,  DBF, and  DBE are other names for  6.

9. Example 4-1d a. Name all angles that have X as a vertex. b. Name the sides of  3. c. Write another name for  3. Answer:  1,  2,  3, and  RXB or  RXN Answer:  AXB,  AXN,  NXA,  BXA Answer:

10. Example 4-2a Measure  TYV and classify it as right, acute, or obtuse.  TYV is marked with a right angle symbol, so measuring is not necessary. Answer: is a right angle.

11. Example 4-2b Measure  WYT and classify it as right, acute, or obtuse. Use a protractor to find that. Answer: > is an obtuse angle.

12. Example 4-2c Measure  TYU and classify it as right, acute, or obtuse. Use a protractor to find that m. Answer: is an acute angle.

13. Example 4-2d Measure each angle named and classify it as right, acute, or obtuse. a.  CZD b.  CZE c.  DZX Answer: 150, obtuse Answer: 90, right Answer: 30, acute

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