2. 4.1 Classifying Triangles textbook page 173

3. Classification by Sides  Equilateral – 3 congruent sides  Isosceles – 2 congruent sides  Scalene – no congruent sides

4. “Checkpoint” pg 173 prob 1-3  1) isosceles  2) equilateral  3) scalene

5. Classification by Angles  Equiangular – 3 congruent angles  Acute – 3 acute angles  Right – 1 right angle  Obtuse – 1 obtuse angle

6. “Checkpoint” pg 174 prob 4-6  4) acute isosceles  5) acute scalene  6) obtuse isosceles

7.  The vertex of a triangle is a point that joins two sides of the triangle. The side not connected to the vertex is the opposite side. A C B point B is a vertex AC is opposite < B

8. Homework  Assignment # 1  textbook page 175  problems 1-22 all, 30-36 all, 57, 67-71 odd