The length, breadth and height of a cuboid are in the ratio 4:2:1 and its total surface area is 2800cm².find the dimensions of the cuboid
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let lenght height and breadth are 4x,2x,x
total surface area =2(lb+bh+hl)
2800=2(4x×2x+2x×x+x×4x)
2800=2(8x^2+2x^2+4x^2)
2800=2×14x^2
2800=28x^2
x^2=2800/28
x^2=100
x=10
total surface area =2(lb+bh+hl)
2800=2(4x×2x+2x×x+x×4x)
2800=2(8x^2+2x^2+4x^2)
2800=2×14x^2
2800=28x^2
x^2=2800/28
x^2=100
x=10
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