Lines, Angles and Triangles

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Presentation transcript:

Lines, Angles and Triangles Opening routine

Topic II: Lines, Angles and Triangles

Lines, Angles and Triangles Triangles Congruence Objective: Use the definition of congruence in terms of rigid motions to show that two triangles are congruent if and only if corresponding pairs of sides and corresponding pairs of angles are congruent. Essential Question: What are the special relationships among angles and sides in isosceles and equilateral triangles?

Lines, Angles and Triangles Isosceles and Equilateral Triangles Vocabulary Isosceles Triangle: Is a triangle with two equal sides. The angles opposite the equal sides are also equal Equilateral Triangle: A triangle with all three sides of equal length. All the angles are 60°. Triangles Inequality Theorem: Any side of a triangle must be shorter than the other two sides added together. If it was longer, the other two sides could not meet!

Lines, Angles and Triangles Isosceles and Equilateral Triangles

Lines, Angles and Triangles Isosceles and Equilateral Triangles

Lines, Angles and Triangles Isosceles and Equilateral Triangles

Lines, Angles and Triangles Isosceles and Equilateral Triangles

Lines, Angles and Triangles Isosceles and Equilateral Triangles

Lines, Angles and Triangles Isosceles and Equilateral Triangles

Lines, Angles and Triangles Isosceles and Equilateral Triangles

Lines, Angles and Triangles Isosceles and Equilateral Triangles

Lines, Angles and Triangles Isosceles and Equilateral Triangles

Lines, Angles and Triangles Isosceles and Equilateral Triangles

Lines, Angles and Triangles Isosceles and Equilateral Triangles

Lines, Angles and Triangles Isosceles and Equilateral Triangles YOU DO - Independent Practice Worksheet Pages 1 and 2

Lines, Angles and Triangles Classifying Triangles Homework Worksheet Isosceles and Equilateral Triangles Pages 1 and 2

Lines, Angles and Triangles Classifying Triangles Closure Essential Question: What are the special relationships among angles and sides in isosceles and equilateral triangles?