Question

The walls and ceiling of a room 7m length,5m width and 3.5m height are covered with Paper 6 diameter wide.find the length of the paper required if no length less than a meter can be bought

Answer 1

Given A room with 6 m= long

5m= wide

3 m= high

And window and door =14 square meters

So the panted area= area of cuboid-areas of the floor- area of windows and doors =2(6*5+6*3+5*3)-6*5-14= 82m^{2}

(like this you do)

Answer 2

CSA of cuboid =2(l+b)h
2(7+5)3.5
2(12)3.5
24×3.5
=84
area of hemisphere
=2/3πr^2
2/3×3.14×3×3
=18.84