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Area or Perimeter?

Area or Perimeter?. That is the question! An online study guide to help you review the 4 th grade area & perimeter objectives. Area. The number of square units needed to cover the region inside a figure. Area is always measured in square units !.

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Area or Perimeter?

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  1. Area or Perimeter? That is the question! An online study guide to help you reviewthe 4th grade area & perimeter objectives. Created by Danielle Miller, Hawk Ridge Math Facilitator

  2. Area • The number of square units needed to cover the region inside a figure. • Area is always measured in square units! There are 40 squares covering the inside of the figure. Created by Danielle Miller, Hawk Ridge Math Facilitator

  3. Area • To calculate the area of a regular figure use the formula: Area = Length x Width Area = 9m x 2mArea = 18 square meters Created by Danielle Miller, Hawk Ridge Math Facilitator

  4. Area To calculate the area of an irregular figure, follow these steps: • Divide the irregular figure into regular figures. • Look for missing measurements that you will need to find the area of each new regular figure. • Find the area of every regular figure. • Add the areas of each regular figure together to find the total area. Created by Danielle Miller, Hawk Ridge Math Facilitator

  5. Step 1:Divide the irregular figure into regular figures. Created by Danielle Miller, Hawk Ridge Math Facilitator

  6. This side was 8m but because you split it to make two regular rectangles, look carefully at every side of the figure to see what the new measurements will be! Don’t forget the rule, opposite sides are equal! This will help you find the missing measurements! Step 2:Look for missing measurements that you will need to find the area of each new regular figure. Created by Danielle Miller, Hawk Ridge Math Facilitator

  7. Find the area of rectangle “A”A= L x W A = 4m x 4m A = 16 square m Step 3:Find the area of every regular figure. Find the area of rectangle “B”A= L x W A = 10m x 4m A = 40 square m Created by Danielle Miller, Hawk Ridge Math Facilitator

  8. Area of rectangle “A”A = 16 square m Step 4:Add the areas of every regular figure. Area of rectangle “B”A = 40 square m 40 square m + 16 square m56 square m The total area is 56 square m. Created by Danielle Miller, Hawk Ridge Math Facilitator

  9. Now You Try! Find the area of this figure: Created by Danielle Miller, Hawk Ridge Math Facilitator

  10. Work it out like this… A = L x W A = 10m x 4m A = 40 square m The length = 6m Because 10m – 4m = 6m The width = 4m Because 10m – 6m = 4m A = L x W A = 10m x 4m A = 40 square m A = L x W A = 6m x 4m A = 24 square m Created by Danielle Miller, Hawk Ridge Math Facilitator

  11. Did you get the right answer? Total Area= 104 square m Created by Danielle Miller, Hawk Ridge Math Facilitator

  12. Try another one… Created by Danielle Miller, Hawk Ridge Math Facilitator

  13. Did you get the right answer? Total area= 3,560 square ft. Created by Danielle Miller, Hawk Ridge Math Facilitator

  14. Perimeter • The distance around a figure. • Perimeter is always measured in linear units. The perimeter of this figure is 51 inches. Created by Danielle Miller, Hawk Ridge Math Facilitator

  15. Perimeter • To calculate the perimeter of a regular figure add the lengths of all the sides! Perimeter = 11m + 3m + 11m + 3m Perimeter = 28 m Created by Danielle Miller, Hawk Ridge Math Facilitator

  16. Perimeter • Now you try… • Did you get P=7m + 4m + 7m + 4m ? • Perimeter=22m Created by Danielle Miller, Hawk Ridge Math Facilitator

  17. Perimeter 4 units 1 unit 3 units 5 units 6 units 4 units 3 units 2 units Created by Danielle Miller, Hawk Ridge Math Facilitator

  18. Perimeter The perimeter of this shape is 28 units. Created by Danielle Miller, Hawk Ridge Math Facilitator

  19. tiles for a bathroom floor lace for the edge of a tablecloth trim for the bulletin board in your classroom paint for a wall grass seed for your front yard M&M candies for the outside edge of a cake top carpet for the reading corner fence for your backyard mulch to cover the playground Area or Perimeter? area perimeter perimeter area area perimeter area perimeter area Created by Danielle Miller, Hawk Ridge Math Facilitator

  20. Online Resourceshttp://www.bgfl.org/bgfl/custom/resources_ftp/client_ftp/ks2/maths/perimeter_and_area/ Created by Danielle Miller, Hawk Ridge Math Facilitator

  21. Online Resourceshttp://www.funbrain.com/poly/ Created by Danielle Miller, Hawk Ridge Math Facilitator

  22. Online Resources http://www.mste.uiuc.edu/users/carvell/rectperim/RectPerim2.html Created by Danielle Miller, Hawk Ridge Math Facilitator

  23. Online Resourceshttp://www.woodlands-junior.kent.sch.uk/maths/measures.htm#Area Created by Danielle Miller, Hawk Ridge Math Facilitator

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