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# 9001 area and perimter

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### 9001 area and perimter

1. 1. Geometry Drill 4/22/14  In your own words define perimeter and area  Make a list of any formula you know that applies to perimeter or area of a geometric figure.
2. 2. Objective SW recall area and perimeter formulas so that they can find the area and perimeter of irregular regions.
3. 3. Compare: Regular polygons vs. polygons
4. 4. Perimeter of a Rectangle P=2b+2h h b
5. 5. Area of a Rectangle A=bh h b
6. 6. Area of a Triangle A=(1/2)bh h b
7. 7. Irregular Region A region(shape) composed of many smaller regions(shapes)
8. 8. Area of an Irregular Region The sum of the areas of all the non- overlapping parts of the region
9. 9. Find the area of the irregular region 43 2
10. 10. Perimeter of an Irregular Region The distance around the region.
11. 11. Find the Perimeter of the region 43 2
12. 12. Conclusions  1) To find the area of an irregular region, find the areas of its smaller _____ and find their _____.
13. 13. Conclusions  1) To find the area of an irregular region, find the areas of its smaller _____ and find their _____. parts sum
14. 14. Conclusions  2) To find the perimeter of an irregular region, find the ________ around the region.
15. 15. Conclusions  2) To find the perimeter of an irregular region, find the ________ around the region. distance
16. 16. Find the perimeter of rectangle ABCD A B C D 5 in. 3 in. 4 in.
17. 17. EXPLORATION We know how to find the area of a rectangle. How can I form a rectangle from this parallelogram?
18. 18. Parallelogram
19. 19. Parallelogram
20. 20. Parallelogram
21. 21. Parallelogram
22. 22. Parallelogram
23. 23. Parallelogram
24. 24. Rectangle
25. 25. b2 b2 b1 b1 h h
26. 26. b2 b2 b1 b1 h h
27. 27. b2 b1 h b2 b1 h
28. 28. b2 b1 h b2 b1 h
29. 29. b2 b1 h Parallelogram b1 b2
30. 30. AREA OF A PARALLELOGRAM A = bh
31. 31. AREA OF A TRIANGLE A = 1/2(bh)
32. 32. AREA OF A TRAPEZOID A = h/2(b1+b2) b1 and b2 are the bases
33. 33. ALTERNATE FORMULA AREA OF A TRAPEZOID A = length of median times the height
34. 34. Find the Area of Trapezoid ABCD 12 10
35. 35. ABCD is a rhombus with diagonals d1 & d2 D C A B
36. 36. AREA OF A RHOMBUS A = 1/2(d1d2) d1 and d2 are the diagonals
37. 37. Find the area: 10 5 6
38. 38. Find the area: 5 42
39. 39. Find the area: 5 12 8
40. 40. Find the area: 12 9 15
41. 41. Find the area: 8 57
42. 42. Area of a Rhombus Find the area of a rhombus if the lengths of the diagonals are 12m and 10 m.
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