Correct Answer: Option A
\(\sqrt{\left(l^2+b^2\right)}=\sqrt{41}\) (or) \(l^2+b^2=41\)
Also , \(lb=20\)
\(\left(l+b\right)^2=l^{2+}b^2+2lb\)
= 41 + 40 = 81
(l + b) = 9.
Perimeter = 2(l + b) = 18 cm.
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