5. Find the area of 4 walls of a cuboidal room with length 35 m, breadth 30 m and height 28 m.
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Answer:
L=35m
B=30m
H=28m
therefore, according to formulae
2(lb+bh+hl)
2(35*30+30*28+28*35)
2*1820
3920m
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