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Area & Perimeter

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A PowerPoint presentation of Perimeter & Area for 4th and 5th grade.

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Area & Perimeter

  1. 1. PERIMETER & AREA <ul><li>Defining and calculating </li></ul>
  2. 2. When your family puts up a new fence around your home, how will they know how much fencing they need? PERIMETER
  3. 3. Perimeter <ul><li>The perimeter of a figure is the distance all the way around the figure. </li></ul>
  4. 4. Perimeter <ul><li>The perimeter is found by adding the lengths of the sides together. </li></ul>
  5. 5. Find the perimeter of the figures. A. B. D. C. P = 24 m P = 21 cm P = 39 mm P = 26 in.
  6. 6. Perimeter of a Square <ul><li>A square is a figure with 4 equal sides. </li></ul><ul><li>The perimeter can be found by adding all 4 sides together. </li></ul><ul><li>It can also be found by multiplying the side length by 4. </li></ul><ul><li>So the formula for the perimeter of a square is: </li></ul><ul><li>P = 4s </li></ul>
  7. 7. Find the perimeter of the squares using the formula P = 4s . A. B. D. C. P = 36 m P = 28 in. P = 44 mm P = 20 cm
  8. 8. Perimeter of a Rectangle <ul><li>A rectangle is a figure with 4 sides. Opposite sides are equal. </li></ul><ul><li>The perimeter can be found by adding all 4 sides together. </li></ul><ul><li>It can also be found by adding twice the width together with twice the length. </li></ul><ul><li>So the formula for the perimeter of a rectangle is: </li></ul><ul><li>P = 2 w + 2 l </li></ul>
  9. 9. Find the perimeter of the rectangles using the formula P = 2 w + 2 l . A. B. D. C. P = 30 cm P = 28 m P = 54 mm P = 28 in.
  10. 10. If your parents want to put new carpet in your room, how will they know how much carpet to buy? AREA
  11. 11. Area <ul><li>The area of a figure is the number of square units that cover the surface of the closed figure. </li></ul>
  12. 12. Area <ul><li>A square unit is a unit that has 4 equal sides. </li></ul><ul><li>For metric units, we say “units squared”. Ex: centimeters squared or cm 2 </li></ul><ul><li>For U.S. Customary, we say “square units” Ex: square inches or sq. in. </li></ul>
  13. 13. Area <ul><li>The area of a figure is found by finding how many square units it takes to cover its surface. </li></ul>
  14. 14. Find the area of the figures. A. B. D. C. A = 16 sq. units A = 27 sq. units A = 30 sq. units A = 8 sq. units
  15. 15. Area of a Square <ul><li>The area of a square is found by finding how many square units it takes to cover its surface. </li></ul><ul><li>It can also be found by multiplying its side length by its side length. </li></ul><ul><ul><li>Multiplying a number by itself is also called “squaring it”. </li></ul></ul><ul><li>So the formula for the area of a square is: A = s x s or A = s 2 </li></ul>
  16. 16. Find the area of the squares using the formula A = s 2 . A. B. D. C. A = 16 cm 2 A = 25 sq. in. A = 49 m 2 A = 81 sq. ft.
  17. 17. Area of a Rectangle <ul><li>The area of a rectangle is found by finding how many square units it takes to cover its surface. </li></ul><ul><li>It can also be found by multiplying its length by its width. </li></ul><ul><li>So the formula for the area of a rectangle is: A = l x w </li></ul>
  18. 18. Find the area of the rectangles using the formula A = l x w . A. B. D. C. A = 24 cm 2 A = 77 sq. in. A = 140 mm 2 A = 48 sq. ft.
  19. 19. Check for understanding. Find the perimeter & area of the figure. <ul><li>The perimeter is the distance ____ _______________________. P = _____ </li></ul><ul><li>The area is the number of _____ ____ it takes to cover its ______. A = _____ </li></ul>all the way around a figure square units surface 28 m 48 m 2

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