Question

Find the length and breadth of the room if they are in the ratio 4 14. Find the total surface area of three cubes each with side 8 cm. If the three cubes are placed next to each other to form a cuboid, what will be the total surface area of the cuboid thus formed? What percentage bas the total surface area increased or decreased with the new arrangement?​

Answer 1

=18a

2

Total surface area of resulting cuboid =2(lb+bh+lh)

=2(3a×a+a×a+3a×a)

=2(7a

2

)

=14a

2

Ratio of total surface area of cuboid to that of cube =

18a

2

14a

2

=

9

7

=7:9