Area and Perimeter Unit Test
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Question
Use the image to answer the question.
A composite shape is drawn, starting with a horizontally aligned rectangle. There is no measurement across the top, and the right side is labeled with a question mark. A horizontally aligned rectangular area marked as 8 feet in length and unknown in width is removed from the bottom left of the original rectangle. The remaining length on the right side is 2 feet. The remaining width on the left side is 3 feet. Corners are marked with right angles.
Tessa designs a supply closet as an addition to her house. The closet is pictured, and its total area is 36 square feet. What is the length in feet of the side of the supply closet labeled with the question mark?(1 point)
feet
To find the length of the side labeled with the question mark, we can subtract the area of the rectangle removed from the original rectangle to find the area of the remaining shape.
Area of original rectangle = length x width
Area of removed rectangle = 8 ft x width
Area of remaining shape = Area of original rectangle - Area of removed rectangle
36 sq ft = (2 ft + x ft) * (3 ft)
36 sq ft = 6 sq ft + 3x sq ft
30 sq ft = 3x sq ft
10 = x
x = 10
Therefore, the length of the side labeled with the question mark is 10 feet.