Express the area \( A \):

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• Let the length be \( l \) and the width be \( w \). The perimeter is given by:
• 2l + 2w = 80
• l + w = 40
• A = l \times w
• Substitute \( w = 40 - l \):
• A = l(40 - l) = 40l - l^2

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