1. Triangles I can differentiate between the different types of triangles. Created by: Maggie Howe and Rachel Tankersley Sycamore Elementary 5th grade

2. Essential Questions: What is a triangle? How do you classify triangles? What is an acute triangle? What is a right triangle? What is an obtuse triangle? What is an isoscelse triangle? What is an equilateral triangle? What is a scalene triangle?

3.  Triangles are everywhere.  They can be found bracing a bridge.

4.  Triangles can be found racking up billiard balls.

5. TTriangles can be classified by sides. OOR TTriangles can be classified by angles.

6. TRIANGLES BY SIDES  SCALENE  ISOSCELES  EQUILATERAL

7. SCALENE TRIANGLE  WHEN 3 PEOPLE GET ON THE SCALES TO SEE HOW MUCH THEY WEIGHT, EACH ONE WEIGHS A DIFFERENT AMOUNT. SO…………

8.  A scalene triangle has no equal sides.  All sides are different lengths.

9. Isosceles Triangles  Isosceles triangles have 2 equal sides.  The angles opposite the equal sides are also equal. <B = <C AB = AC

10. Equilateral Triangles  All 3 sides of an equilateral triangle are equal.  Each angle of an equilateral triangle are equal.  Each angle must be 60 degrees.

11.  Now let’s review.  What kind of triangle has all 3 sides and angles equal?

12. Equilateral Triangle

13.  What kind of triangle has all sides a different length ?

14. SCALENE TRIANGLE

15.  What kind of triangle has 2 equal sides?

16. AN ISOSCELES TRIANGLE

17. TRIANGLES BY ANGLES  Acute  Right  Obtuse

18.  A right triangle has one 90 degree or RIGHT angle.

19. Acute triangles 3 angles less than 90 degrees.

20. OBTUSE TRIANGLE  An obtuse triangle has one obtuse angle.

21. What type of triangle is this?  Use right, obtuse, or acute.

22. What type of triangle is this?  Use right, obtuse, or acute.

23. What type of triangle is this?  Use right, obtuse, or acute.

24. What type of triangle is this?  Use right, obtuse, or acute.

25. What type of triangle is this?  Use right, obtuse, or acute.

26. What type of triangle is this?  Use isosceles, scalene, or equilateral.

27. What type of triangle is this?  Use isosceles, scalene, or equalateral.

28. What type of triangle is this?  Use isosceles, scalene, or eqilateral.

29. What type of triangle is this?  Use isosceles, scalene, or equilateral.

30. What type of triangle is this?  Use isosceles, scalene, or equilateral.

31. Which one of these is labeled incorrectly? Right Triangle Equilateral Triangle Scalene Triangle

32. 32 Follow Up Draw an acute triangle. Draw a right triangle. Draw an obtuse triangle. Draw an isoscelse triangle. Draw an equilateral triangle. Draw a scalene triangle. Answer the following questions: Can you have an acute, scalene triangle? Can you have a right isoscelese triangle? Can you have an obtuse, equilateral triangle?