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Define x :
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Width = x
Length = x + 8
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Solve x :
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Given that the perimeter is 90:
*listing from the top lefthand corner, clockwise
(x) + (x + 8) + (x) + (8) + (x+8) + (x) + (x+8) + (x) + (8) + (x+8) = 90
8x + 48 = 90
8x = 42
x = 5.25
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Find Length and Width :
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Width = x = 5.25 cm
Length = 5.25 + 8 = 13.25 cm
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Find Area :
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4 rectangles = 5.25 x 13.25 x 4 = 278.25 cm²
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Answer: Area = 278.25 cm²
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