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Lines, Angles and Triangles

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Presentation on theme: "Lines, Angles and Triangles"— Presentation transcript:

1 Lines, Angles and Triangles
Opening routine

2 Topic II: Lines, Angles and Triangles

3 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?

4 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!

5 Lines, Angles and Triangles
Isosceles and Equilateral Triangles

6 Lines, Angles and Triangles
Isosceles and Equilateral Triangles

7 Lines, Angles and Triangles
Isosceles and Equilateral Triangles

8 Lines, Angles and Triangles
Isosceles and Equilateral Triangles

9 Lines, Angles and Triangles
Isosceles and Equilateral Triangles

10 Lines, Angles and Triangles
Isosceles and Equilateral Triangles

11 Lines, Angles and Triangles
Isosceles and Equilateral Triangles

12 Lines, Angles and Triangles
Isosceles and Equilateral Triangles

13 Lines, Angles and Triangles
Isosceles and Equilateral Triangles

14 Lines, Angles and Triangles
Isosceles and Equilateral Triangles

15 Lines, Angles and Triangles
Isosceles and Equilateral Triangles

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

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

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

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