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This document, created by Danielle Miller, provides steps to calculate the area and perimeter of irregular shapes by dividing them into regular figures, finding the missing measurements, and adding the areas of each regular figure. It also includes examples and online resources.
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Created by Danielle Miller, Hawk Ridge
Math Facilitator
That is the question!^ That is the question!
How to find area and perimeter of irregular shapes..How to find area and perimeter of irregular shapes..
..
Created by Danielle Miller, Hawk Ridge
Math Facilitator
There are 40 squarescovering the inside
of the figure.
Created by Danielle Miller, Hawk Ridge
Math Facilitator
To calculate the area of an irregular figure, follow thesesteps:
Divide the irregular figure into regular figures.
Look for missing measurements that you willneed to find the area of each new regular figure.
Find the area of every regular figure.
Add the areas of each regular figure together tofind the total area.
Created by Danielle Miller, Hawk Ridge
Math Facilitator
Step 1:
Created by Danielle Miller, Hawk Ridge
Math Facilitator
Step 3:
Find the area of
rectangle “A”
A= L x W A = 4m x 4m A = 16 square m
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
Step 4:
Area of rectangle “A”
A = 16 square m
Area of rectangle “B”
A = 40 square m
40 square m
56 square m The total area is
56 square m.
Created by Danielle Miller, Hawk Ridge
Math Facilitator
Work it out like this…
A = L x WA = 10m x 4m A = 40 square m
A = L x WA = 10m x 4m A = 40 square m
The width = 4m^ Because 10m – 6m = 4m
The length = 6m^ Because 10m – 4m = 6m
A = L x WA = 6m x 4m A = 24 square m
Created by Danielle Miller, Hawk Ridge
Math Facilitator
Did you get the right answer?
Total Area= 104 square m
Created by Danielle Miller, Hawk Ridge
Math Facilitator
Did you get the right answer?
Total area= 3,560 square ft.
Created by Danielle Miller, Hawk Ridge
Math Facilitator
The perimeter of this
figure is51 inches.
Created by Danielle Miller, Hawk Ridge
Math Facilitator
Created by Danielle Miller, Hawk Ridge
Math Facilitator
5 units 4 units
2 units
6 units 3 units 3 units
1 unit
4 units
Created by Danielle Miller, Hawk Ridge
Math Facilitator
Area or Perimeter?^ Area or Perimeter?
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
area
area area area
perimeter
perimeter
perimeter
perimeter
Created by Danielle Miller, Hawk Ridge
Math Facilitator
Online Resources
