1. 4.1 Classifying Triangles

2. Students will be able to… - Classify triangles by their angle measures and side lengths. - Use triangle classification to find angle measures and side lengths.

5.  Go over tests and grades

6. TermNameDiagramAdditional Notes Acute Triangle- Has three acute angles - Use to classify triangles by its angles

7. TermNameDiagramAdditional Notes Acute Triangle- Has three acute angles - Use to classify triangles by its angles Equiangular Triangle -Has three congruent angles -All angles 60º -Use to classify triangles by its angles

8. TermNameDiagramAdditional Notes Acute Triangle- Has three acute angles - Use to classify triangles by its angles Equiangular Triangle -Has three congruent angles -All angles 60º -Use to classify triangles by its angles Right Triangle-Has one right angle -Use to classify triangles by its angles

9. TermNameDiagramAdditional Notes Acute Triangle- Has three acute angles - Use to classify triangles by its angles Equiangular Triangle -Has three congruent angles -All angles 60º -Use to classify triangles by its angles Right Triangle-Has one right angle -Use to classify triangles by its angles Obtuse Triangle-Has one obtuse angle -Use to classify triangles by its angles

10. Term NameDiagramAdditional Notes Equilateral Triangle -Has three congruent sides -Use to classify triangles by side lengths

11. Term NameDiagramAdditional Notes Equilateral Triangle - Has three congruent sides -Use to classify triangles by side lengths Isosceles Triangle - Has two congruent sides -Use to classify triangles by side lengths

12. Term NameDiagramAdditional Notes Equilateral Triangle - Has three congruent sides -Use to classify triangles by side lengths Isosceles Triangle - Has two congruent sides -Use to classify triangles by side lengths Scalene Triangle- Has no congruent sides -Use to classify triangles by side lengths

18.  It is important to remember…  Triangles can be classified 2 ways; by their Angle Measures or by their side lengths.

19.  Remember if you ever have trouble reading a picture ask about it! Especially on the test.  If you are unsure what angle something is pointing to, ask about it.

20.  What are the three triangles in the picture?  Classify each triangle by angle measures

24.  When you look at a figure, you cannot assume segments are congruent based on appearance.  They must be marked as congruent either with numbers or tic marks.

26. EG = EF + FG EG = 10 + 4 EG = 14

28. JL = 5 (8.5) + 2 = 44.5 JK = 4 (8.5) – 10.7 = 23.3 KL = 2 (8.5) + +6.3 = 23.3 Therefore… Isosceles Triangle

29. Therefore… Equilateral Triangle