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Answer :

Length of rectangle = 40cm

Diagonal = 41 cm

\(Breath^2 = 41^2 - 40^2 \)

Or, \( breath^2= 1681 – 1600 \)

Or, breath = \(\sqrt{81} \) cm

Breath = 9 cm

Perimeter of rectangle = 2×(40+9) = 2×49 = 98 cm

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