1. Types of Triangles

2. Angles The angles in a triangle add up to 180 0 60 o + 60 o + 60 o = 180 0

3. Triangles can be classified in two ways You can name triangles by their angles You can name triangles by their sides

4. Acute Triangle All angles measure less than 90º

5. Right Triangle One angle measures exactly 90º

6. Obtuse Triangle One angle measures more than 90º

7. Scalene Triangle All sides are different lengths

8. Isosceles Triangle Two sides have the same length

9. Equilateral Triangle All sides have the same length

10. Practice Can you name each triangle by its sides and its angles? Scalene and Acute Isosceles and Right Scalene and Obtuse

11. Now that you have finished this presentation, return to the math website and start your next activity