Answer :

Here,


It is given in the question that,                                                    


Length of a rectangle = 40 cm                                                              


Diagonal of a rectangle = 41 cm


We know that,


Diagonal of a rectangle divides it into two right-angled triangles


By using Pythagoras theorem, we get


(Diagonal)2 = (Length)2 + (Breadth)2


(41)2 = (40)2 + b2


b2 = (41)2 – (40)2


b2= 1681 – 1600


b2 = 81


b =


b = 9 cm


Thus,


Perimeter of rectangle = 2 (l + b)


= 2 (40 + 9)


= 2 (49)


= 98 cm

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