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,
So,
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:
2lb+2bh+2lh-2lb
I.e 2h(l+b)

Regards

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