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

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. 4. 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?

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

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.

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

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

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

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:

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

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

Exit Ticket Find the area of the composite figure.

Homework