Answer:
60 m
Step-by-step explanation:
The area of each pad is 1 x 1 = 1 m^2
The total area of the square 81 square pads will be 81 x 1 m^2 = 81 m^2
The common factors of 81 are 1, 3, 9, 27, 81
the possible arrangements will be
- 81 m x 1 m
- 27 m x 3 m
- 9 m x 9 m (this should be excluded since it will give a square shaped arrangement)
the least rectangle will be formed with dimension of 27 m by 3 m
27 m x 3 m gives 81 m^2
perimeter = 2(27 + 3) = 2 x 30 = 60 m
