1. Area of Irregular Shapes
Objectives:
I can calculate the area of irregular shapes.
I can find the area of shapes that are partially covered.

2. Let’s Review Area and Perimeter of Regular Shapes!
10 cm
4 cm
A =
P =
5 in
A =
P =
9 cm
7 cm
A =
P =

3. Example: How to find the area of irregular shapes
Find any unknown sides
Divide the irregular shape into squares or rectangles
Find the area of each square or rectangle
Add the areas together to find the total area of the shape
See next slide for example!
9cm
6cm
5cm
10cm

4. How to find the area of irregular shapes
Find any unknown sides
Divide the irregular shape into squares or rectangles
Find the area of each square or rectangle
Add the areas together to find the total area of the shape
4 cm
= 66
(the sum of the area of the square and rectangle)
Area = 66 square cm.
A = l x w
A = 4 x 4
A = 16
4 cm
9cm
6cm
A = l x w
A = 10 x 5
A = 50
5cm
10cm

5. Problem # 1 2m 7m 2m 4m
12m

6. Problem # 2
11cm
4cm
6cm
10cm
4cm
7cm

7. Problem # 3
Example
Work out the area shaded in each of the following diagrams
6 cm
4 cm
2 cm
8 cm

8. This problem is not in your notebook!
Extra Practice
This problem is not in your notebook! 9m 7m 5m 5m 5m
34m

9. Find the Area of the Rectangle
Problem # 4

10. This problem is not in your notebook!
Extra Practice
This problem is not in your notebook!

11. Left Side (Independent Practice)
Create a triple T chart like the one below and solve.
Irregular Shape
Show Your Work
Area

12. Exit Ticket
Pass out to students and have them turn in the math basket!