The diagonal of a rectangle is `sqrt(41)` and is area is 20 sq. cm. he perimeter of the rectangle must be :
`sqrt(l^2 + b^2) = sqrt(41) or l^2 + b^2 = 41. Also lb = 20.`
`(l^2 + b^2) = (l^2 + b^2 + 2lb` = 41 + 40 = 81
`rArr (l + b) = 9`
`:.` perimeter = 2(l + b) = 18 cm.
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