1. TODAY IN GEOMETRY…  Review 4.1 concepts  Learning Goal: 4.2 Identify Congruent Triangles  Independent practice  Ch.4 QUIZ-Thursday/Friday

2. REVIEW: Ways to classify triangles by SIDES: Scalene – no congruent sides Isosceles – 2 congruent sides Equilateral – All congruent sides Ways to classify triangles by ANGLES: Acute – All angles less than 90 degrees Right – One angle is 90 degrees Obtuse – One angle is greater than 90 degrees Equiangular – All angles are congruent

3. 1 23 <1 + <2 + <3 = 1800 1 2 4 <1 + <2 = <4 Triangle Sum Theorem Exterior Angle Theorem

4. Congruent Figures: All the parts of one figure are congruent to the corresponding parts of the other figure. Corresponding Parts: Corresponding sides and corresponding angles. A B C D E F

5. J K L T R S

7. Third Angles Theorem: If two angles of one triangle are congruent to two angles of another triangle, then the third angles are also congruent. SO

9. A B C D

10. HOMEWORK #3: Pg. 228: 3-10, 15-16, 19-21 Pg. 231: 33-40 If finished, work on other assignments: HW #1: 221: 1-26, 32, 35-37 HW #2: Advanced Angles WS