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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6. Contents Lesson 4-1Classifying Triangles Lesson 4-2Angles of Triangles Lesson 4-3Congruent Triangles Lesson 4-4Proving Congruence–SSS, SAS Lesson 4-5Proving Congruence–ASA, AAS Lesson 4-6Isosceles Triangles Lesson 4-7Triangles and Coordinate Proof

7. Lesson 6 Contents Example 4Use Properties of Equilateral Triangles OBJECTIVE: To use properties of equilateral triangles (2.9.8D) (M8.C.1.1)

8. Example 6-4a Since the angle was bisected, Each angle of an equilateral triangle measures 60°.  EFG is equilateral, and bisects bisects Find and

9. Example 6-4b Answer: Add. Exterior Angle Theorem Substitution is an exterior angle of  EGJ.

10. Example 6-4c Subtract 75 from each side. Linear pairs are supplementary. Substitution Answer: 105  EFG is equilateral, and bisects bisects Find

11. a. Find x. Example 6-4d b. Answer: 90 Answer: 30  ABC is an equilateral triangle. bisects

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