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Lesson 1: Lesson 2: Lesson 3: Lesson 4: Lesson 5: Lesson 6: Lesson 7: Lesson 8: 4.1/4.2 4.3 4.4/4.5 4.4/4.5 4.7 4.6 4.8 Review Warm Up USING A RULER, draw a triangle that fills the space in your notes. Pass your triangle to a partner. Measure the angles in the triangle. What do you notice? Triangle Sum Conjecture The sum of the measures of the angles in every triangle ________________________. equals 180° In this lesson we will answer… How are the measures of the angles in a triangle related? Using the Triangle Sum Conjecture Using the Triangle Sum Conjecture Using the Triangle Sum Conjecture Angles of a Triangle Use the Triangle Sum Conjecture and your algebra skills to solve for x. Angles of a Triangle Angles of a Triangle Angles of a Triangle Angles of a Triangle In this lesson we will answer… Do I remember the parts of an isosceles triangle? Is there anything special about the angles of an isosceles triangle? What can I assume to be true of any isosceles triangle? Parts of the Isosceles Triangle Using the triangle provided: Measure AB and BC. What is true of these sides? Fold triangle ABC to compare A and What is true of A and C? Check with your partners! C. Parts of the Isosceles Triangle DEF: An isosceles triangle has at least 2 congruent sides Vertex Angle Leg Leg Base Angle Base Angle Base Isosceles Triangle Conjecture If a triangle is isosceles, then the base angles are congruent _______________________________. Converse of the Isosceles Triangle Conjecture base angles If a triangle has congruent ____________________ isosceles then it is __________________________. Examples Examples Examples What STUCK with You? Complete the Ticket Out the Door. Explain how you arrived at each answer. Almost Finished… Clear Your Calculator and Turn It Off 2nd + 7 1 2 then 2nd On Take out your agenda – copy down due dates Quizzes Tests Homework Practice 4.1 and 4.2 Do NOT pack up until you are told to do so!