Question

Oliver is decorating the bulletin board in the school's lobby. The bulletin board is a 9ft by 12ft rectangle. He decides to add a black border around the entire bulletin borad. What is the length of the border that he needs?​

Answer 1

Answer:

108ft.

Step-by-step explanation:

Length of the board = 9ft.

Breadth of the board= 12ft.

The length of the border that is needed to cover the entire board = Perimeter of the board

= 9×12

= 108 ft.

Answer 2

Answer:

42ft

Step-by-step explanation:

Length= 9 ft

Breadth= 12 ft

the length of the border of board= perimeter of board

so board is rectangle.

So

Perimeter of rectangle= 2×(Length + breadth)

= 2×(9ft +12ft)

= 2× 21 ft

= 42 feet