Question

20cm long cylindrical pencil of diameter 1cm each are packed in cuboidal box in 2 rows.If there are 20 pencils to be arranged in this box then what is the surface area of this box

Answer 1

tsa of cuboid = 2(bh+lb+lh)

b=1×10=10

h=1×2=2

l=20

2(lh+bh+lb)

2{(20×2)+(10×2)+(20×10)}

2{(40)+(20)+(200)}

2{260}

520cm square=tsa