4. External dimensions of a wooden cuboidal box are 25 cm x 20 cm x 12 cm.
If the thickness of the wood is 2.8 cm all around, find the volume of the
wood contained in the box.
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Answer:
Given,
L= 25 cm
B= 20 cm
H= 12 cm
Surface area of wooden cuboidal box= 2(lb+lh+bh)
=2(25*20+25*12+20*12)
= 2(500+300+240)
= 2*1040
=2080
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