2. Area Formulas

3. Rectangle

4. What is the area formula?

5. Rectangle What is the area formula?bh BASE X HEIGHT

6. Rectangle What is the area formula?bh What other shape has 4 right angles?

7. Rectangle What is the area formula?bh What other shape has 4 right angles? Square!

8. Rectangle What is the area formula?bh What other shape has 4 right angles? Square! Can we use the same area formula?

9. Rectangle What is the area formula?bh What other shape has 4 right angles? Square! Can we use the same area formula? Yes

10. Practice! Rectangle Square 10m 17m 14cm

11. Answers Rectangle Square 10m 17m 14cm 196 cm 2 170 m 2

12. So then what happens if we cut a rectangle in half? What shape is made?

13. Triangle So then what happens if we cut a rectangle in half? What shape is made?

14. Triangle So then what happens if we cut a rectangle in half? What shape is made? 2 Triangles

15. Triangle So then what happens if we cut a rectangle in half? What shape is made? 2 Triangles So then what happens to the formula?

16. Triangle So then what happens if we cut a rectangle in half? What shape is made? 2 Triangles So then what happens to the formula?

17. Triangle So then what happens if we cut a rectangle in half? What shape is made? 2 Triangles So then what happens to the formula? bh

18. Triangle So then what happens if we cut a rectangle in half? What shape is made? 2 Triangles So then what happens to the formula? bh 2

19. Practice! Triangle 5 ft 14 ft

20. Answers 35 ft 2 Triangle 5 ft 14 ft

21. Summary so far... bh

22. Summary so far... bh

23. Summary so far... bh

24. Summary so far... bh

25. Summary so far... bh 2

26. Parallelogram Let’s look at a parallelogram.

27. Parallelogram Let’s look at a parallelogram. What happens if we slice off the slanted parts on the ends?

28. Parallelogram Let’s look at a parallelogram. What happens if we slice off the slanted parts on the ends?

29. Parallelogram Let’s look at a parallelogram. What happens if we slice off the slanted parts on the ends?

30. Parallelogram Let’s look at a parallelogram. What happens if we slice off the slanted parts on the ends?

31. Parallelogram Let’s look at a parallelogram. What happens if we slice off the slanted parts on the ends?

32. Parallelogram Let’s look at a parallelogram. What happens if we slice off the slanted parts on the ends?

33. Parallelogram Let’s look at a parallelogram. What happens if we slice off the slanted parts on the ends?

34. Parallelogram Let’s look at a parallelogram. What happens if we slice off the slanted parts on the ends?

35. Parallelogram Let’s look at a parallelogram. What happens if we slice off the slanted parts on the ends?

36. Parallelogram Let’s look at a parallelogram. What happens if we slice off the slanted parts on the ends?

37. Parallelogram Let’s look at a parallelogram. What happens if we slice off the slanted parts on the ends? What will the area formula be now that it is a rectangle?

38. Parallelogram Let’s look at a parallelogram. What happens if we slice off the slanted parts on the ends? What will the area formula be now that it is a rectangle? bh

39. Parallelogram Be careful though! The height has to be perpendicular from the base, just like the side of a rectangle! bh

40. Parallelogram Be careful though! The height has to be perpendicular from the base, just like the side of a rectangle! bh

41. Parallelogram Be careful though! The height has to be perpendicular from the base, just like the side of a rectangle! bh

42. Rhombus The rhombus is just a parallelogram with all equal sides! So it also has bh for an area formula. bh

43. Practice! Parallelogram Rhombus 3 in 9 in 4 cm 2.7 cm

44. Answers 10.8 cm 2 27 in 2 Parallelogram Rhombus 3 in 9 in 4 cm 2.7 cm