1. Lesson 3 Area of Composite Figures
Unit 4B Measure Figures
Lesson 3
Area of Composite Figures

2. Lesson 3: Area of Composite Figures
Objective: Swbat find the area of composite figures.
Do Now: Find the area of each circle.
r = 5 cm 2. r = 10 m
d = 6 in d = 8 ft.
5. Rick wants to make a big cookie cake. If he uses a round cookie sheet that is 12 in. in diameter, about how much cookie dough will he need to cover the pan?

3. Lesson 3: Area of Composite Figures
Definition Composite figure is made up of two or more shapes.

4. Lesson 3: Area of Composite Figures
To find the area of a composite figure, separate the figure into shapes of known areas. Then add the areas of each figure.

5. Lesson 3: Area of Composite Figures
Shape Area Formula Parallelogram A = bh Rectangle A = bh or lw Square A = s2 or lw or bh Triangle A = 1/2bh Trapezoid A = 1/2h( b1 + b2 ) Circle A = ∏r2 Semicircle A = ∏r2 2

6. Lesson 3: Area of Composite Figures
Example1: Rectangle: A = bh Triangle: A = 1bh 2

7. Lesson 3: Area of Composite Figures
Example 2: Rectangle 1: A = bh Rectangle 2: A = bh

8. Lesson 3: Area of Composite Figures
Find the Area of the Shaded Region Large Rectangle: A = bh Small Rectangle: A = bh Area of shaded region:

9. Classwork
Guided Practice #1 – 3 Independent Practice #1 – 9 (odd) Problem Solving Practice #1 - 6

10. Closure
Question: How do you find the area of a composite figure? Exit Ticket Homework: Practice #1 – 10 (odd)

11. Exit Ticket
Find the area of the composite figure.

12. Homework