9.2 Find the Area of Combined Rectangles
Presentation
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Mathematics
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4th Grade
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Practice Problem
•
Medium
+2
Standards-aligned
Samantha Narciso
Used 145+ times
FREE Resource
10 Slides • 6 Questions
1
9.2 Find the Area of Combined Rectangles
I can find the area of a figure made of combined rectangles.
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Step it Out Problem One
Brody and his dad are designing a tree house. The diagram shows the shape of the floor. What is the total area of the floor?
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Multiple Choice
Which equation would I use to find the area of rectangle A?
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We would use 6 x 8 = A
The length of Rectangle A is 8 feet, and the width is 6 feet.
A = 8 × 6, so the area of Rectangle A is 48 square feet.
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Multiple Choice
Which equation would I use to find the area of rectangle
B?
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We would use 16 x 15 = A
The length of Rectangle B is 16 feet, and the width is 15 feet.
A = 16 × 15, so the area of Rectangle B is 240 square feet.
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Multiple Choice
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The total area of rectangles A and B is 288
The area of Rectangle A is 48 square feet. The area of Rectangle B is 240 square feet. 48 + 240 = 288, so the total area is 288 square feet.
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Step it Out Problem 2
Brody cut an opening for a window in the wall of the tree house. What is the area of the wall?
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Fill in the Blanks
What is the total length of the entire rectangle?
Type answer...
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The total length is 8. This means the area of the rectangle is 48.
To find the measure of the longest side, you add 6 ft and 2 ft. The length is 8 ft, and the width is 6 ft. Substitute the length and width measures in the formula for the area of the rectangle. A = 8 × 6, so the area of the whole wall is 48 square feet.
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Fill in the Blanks
What is the area of the cut-out space?
Type answer...
13
The area is 6 square feet.
The length of the window is 3 ft, and the width is 2 ft.
A = 3 × 2, so the area of the window is 6 square feet.
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Multiple Choice
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The area of the wall is 42 square feet.
To find the area of the wall, subtract the area of the window from the area of the whole wall. 48 – 6 = 42, so the area of the wall is 42 square feet.
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9.2 Find the Area of Combined Rectangles
I can find the area of a figure made of combined rectangles.
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