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# Cpctc and isoscels traingle

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### Cpctc and isoscels traingle

1. 1. 11/22/13 Gt Geometry Drill Given E is the midpoint of  MJ; TE perpendicular to MJ Prove Triangle   T M E J
2. 2. Geometry Objective STW prove  triangles are  congruent using our  new shortcuts!
3. 3. Recall According to the  definition of congruent  triangles If two triangles  are congruent, then their  corresponding parts are  congruent.
4. 4. CPCTC Corresponding Parts of Congruent Triangles are Congruent
5. 5. Copy and Prove Given:FG = OG,    bisects FO GR Prove: F    O
6. 6. GT Geometry Drill Put homework on your desk with a pen . Draw two segments on your paper, one  7 cm long and the other 9 cm long. Construct a triangle with two sides  congruent using the segments you drew. Changes and updates
7. 7. Objective: STW develop and apply the Isosceles  Triangle Theorem
8. 8. Do you remember? What is the definition  of an isosceles  triangle?
9. 9. ISOSCELES TRIANGLE vocabulary legs vertex angle base base angles C B A
10. 10. Isosceles Triangle Theorem If two sides of a triangle are  congruent, then the angles  opposite those sides are  congruent. C B A
11. 11. ??????????????????????? Is the converse true?
12. 12. Converse Isosceles  Triangle Theorem If two angles of a triangle  are congruent, then the  sides opposite those  angles are congruent.
13. 13. Eyes on Isosceles  Triangles