The perimeter of the rectangle is 112cm and l :b=4:3 then it dignoals is
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perimeter = l + b = 112cm
l : b = 4 : 3
l = 4x , b = 3x
4x + 3x = 112
7x=112
x=112/7
x=16cm
l = 4(16)cm
b=3(16)cm
l = 64cm, b=48cm
diagonal = √(b)^2 + (h)^2
diagonal = √(48)^2 + (64)^2
diagonal = √2304 + 4096
diagonal = √6400
diagonal = 80cm
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