Question

A closed box made of steel of uniform thick-ness has
length, breadth and height 12 dm, 10 dm and 8 dm
respectively. If the thickness of the steel sheet is 1
dm, then the inner surface area is
(A) 456 dm
(B) 376 dm
(C) 264 dm-
(D) 696 dm.​

Answer 1

Step-by-step explanation:

A closed box made by steel with uniform thickness length 12 dm ,breath  10 dm and 8 dm and thickness  of steel is 1 dm

Then inner length =12-2=10 dm ,breadth=10-2=8 dm and height=8-2=6 dm  

So surface area of box=2(lb+bh+lh)=2(10×8)+(8×6)+(10×6)=2(80+48+60)=2×188=376dm  

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