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TODAY IN GEOMETRY… Review for CH. 4 QUIZ CH. 4 QUIZ – TODAY! Learning Goal: 4.3 You will use the side lengths to prove triangles are congruent. Independent practice

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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

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

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REVIEW: Find the value of x. Then classify the triangle by its angles.

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CHAPTER 4 QUIZ You have the rest of class to complete your quiz Are you prepared? Pencil? Calculator? Yellow notes allowed If you finish early: Finish any missing assignments. Work on something quietly as the rest of your fellow classmates complete their quizzes. NO TALKING. STAY IN YOUR SEATS. RETURN ANY BORROWED BOOKS AND CALCULATORS. Turn in any missing or corrected assignments.

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SSS (side, side, side) Postulate: If three sides of one triangle is congruent to three sides of a second triangle, then the two triangles are congruent.

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PRACTICE: Decide whether the congruence statement is true. EXPLAIN your reasoning.

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EXAMPLE: Find the distances of each segment.

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*Both triangles are congruent if all sides are congruent. SO…prove all sides are congruent!

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STATEMENT REASON 1. Given 2. Reflexive Property 3. SSS

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STATEMENT REASON 1. Given 2. Reflexive Property 3. SSS S S S

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STATEMENT REASON 1. Given 2. Definition of Midpoint 3. SSS S S S

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HOMEWORK #4: Pg. 236: 5, 7, 9-12, 24, 26 (Graph paper needed) If finished, work on other assignments: HW #1: 221: 1-26, 32, 35-37 HW #2: Advanced Angles WS HW #3: Pg. 228: 3-10, 15-16, 19-21 Pg. 231: 33-40

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