1. Area of Triangles

2. Area of each? How many boxes?

3. Area of each? How many boxes?
12 u2
12 u2

4. Same Area What do they have in common?
12 u2
12 u2

5. Area is 12u2 for ALL
What do these have in common?

6. 6 is the base of each?
4 is the height

7. What is the formula for the AREA of a Triangle?

8. What is the formula for the AREA of a Triangle?
How do you get from 6 and 4 to 12?

9. Look at this rectangle
A = length * width
A = 9 * 4
A = 36 u2

10. Look at this rectangle Area of Rectangle = 36 u2
What would HALF the area of this rectangle be?

11. Look at this rectangle Area of Rectangle = 36 u2
What would HALF the area of this rectangle be?
Half of 36 is 18 u2

12. Look at this rectangle
Cut the Rectangle is half. Can you make two equal triangles?

13. Two Triangles
Each Triangle A = 18u2
base = ?
height = ?

14. Two Triangles
Each Triangle A = 18u2
base = 9
height = 4

15. Two Triangles
Each Triangle A = 18u2
b = 9, h = 4
A = 18u2

16. Each Triangle A = 30u2
b = 10, h = 6
A = 30u2

17. Does the formula fit?

18. The base and height of a Triangle

19. Height of Triangle

20. The base and height of a Triangle

21. The base and height of a Triangle

22. What is the base? What is the height?

23. What is the base? What is the height?

24. What is the base? What is the height?

25. What is the base? What is the height?

26. What is the base? What is the height?

27. What is the base? What is the height?

28. What is the base? What is the height?

29. Find the Area

30. Find the Area

31. Find the Area

32. Find the Area

33. Find the Area

34. Find the Area

35. Find the Area

36. Find the Area

37. Find the Area

38. Find the Area

39. Find the Area

40. Find the Area

41. Find the Area

42. Find the Area

43. Find the Area

44. Find the Area

45. Types of Triangles
Classify by ANGLES

46. Types of Triangles
Classify by SIDES

47. Find the Area

48. 12 u2
Answers
6 u2
6 u2
24 u2