1. Triangles

2. Can be classified by the number of congruent sides
Triangles
Can be classified by the number of congruent sides

3. Scalene Triangle
Has no congruent sides

4. Has at least two congruent sides
Isosceles Triangle
Has at least two congruent sides

5. Has three congruent sides
Equilateral Triangle
Has three congruent sides

6. Can be classified by the angle measures
Triangles
Can be classified by the angle measures

7. Right Triangle
Has one right angle

8. Acute Triangle
Has three acute angles

9. Triangle with one obtuse angle
Obtuse Triangle
Triangle with one obtuse angle

10. Cut any shape triangle out of a sheet of paper
Triangles
Cut any shape triangle out of a sheet of paper

11. Tear off the corners. Piece them together by having the corners touch.
Triangles
Tear off the corners. Piece them together by having the corners touch.

12. The corners form what type of angle?
Triangles
The corners form what type of angle?

13. The sum of the angles of a triangle is 180 degrees
Triangles
The sum of the angles of a triangle is 180 degrees

14. To find a missing angle, add up the 2 given angles
Triangles
To find a missing angle, add up the 2 given angles

15. Subtract the sum from 180 and you have the missing angle
Triangles
Subtract the sum from 180 and you have the missing angle

16. Congruent Triangles

17. Have the same SIZE and the same SHAPE
Congruent Triangles
Have the same SIZE and the same SHAPE

18. May be flipped and/or rotated
Congruent Triangles
May be flipped and/or rotated

19. Congruent Triangles
BE CAREFUL
WHEN YOU NAME
THE SHAPE

20. Name congruent CORRESPONDING parts
Congruent Triangles
Name congruent CORRESPONDING parts
(sides and angles)
IN ORDER

21. Make sure the letters are in CORRESPONDING order
Congruent Triangles
Make sure the letters are in CORRESPONDING order

22. ABC is congruent to DEF B F E D A C

23. One for you
Name the congruent triangles remembering to name the angles in order F E Z D Y X