How much feet of border material is needed for a 12 feet by 18 feet garden?

P = 2L + 2W

P = (2 * 12) + (2 * 18)

P = ________ feet

p=24+36

p=60 feet

To calculate the amount of border material needed for a rectangular garden, you need to find the perimeter of the garden. The perimeter is the distance around the garden and represents the total length of the border.

In this case, the garden dimensions are 12 feet by 18 feet. To find the perimeter, you can use the formula:

Perimeter = 2 * (Length + Width)

Substituting the given values, we get:

Perimeter = 2 * (12 + 18)
Perimeter = 2 * 30
Perimeter = 60 feet

Therefore, you would need 60 feet of border material for a garden that is 12 feet by 18 feet in size.