Meritnation experts i need my ans soon????

Please find this answer

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That's lidless cuboid which has no roof.

So, when you add lsa+ base area i.e rectangle BGHC, you get the area of the lidless cuboid.

In case of hollow cuboid, there's neither roof nor floor,
In that situation,TSA of the hollow cuboid:
2(lb+bh+lh)-2lb [You must subtract the roof as well as floor from the TSA of the solid cuboid]
So, you get:
I.e 2h(l+b)


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it is easy it means the cuboid with no roof
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What are you looking for?