The length, breadth, and height of a rectangular box are 80 cm, 40 cm, and 20 cm, respectively. If a square paper of 40 cm length is to be glued on it, how many such papers will be required?
Answers
Answered by
57
Answer:
Surface area of cuboid = 2(lb+lh+bh)
=2(80×40+80×20+40×20)
=2(3200+1600+800)
=2(5600)
=11200cm sq.
Sheet needed to cover the box = 11200÷40=280
sheet needed = 280
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Answered by
8
Answer:
7
Step-by-step explanation:
upperside 80*40= 2*40cm sq papers
similarly lower side 2 papers. =2*2=4papers
sides 20*40 means 1/2 the sqpaper 2*1/2=1paper
one side opposite faces need 2 half 40cm sq paper
another side opp sides need 4*1/2 40cm sq paper
4*1/2=2papers
therefore all together 4+1+2=7papers
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