If a rectangular garden is 20 ft. by 40 ft., how many feet of fence are needed to enclose it?

Answer 1

perimeter equals twice the length plus twice the width.

Answer 2

P = 2l + 2w (2 times the length plus 2 times the width)

P = 2(40) + 2(20)

P = 80 + 40

P = 120 ft

You can also add the four sides together. (20 + 20 + 40 + 40)

Answer 3

Since fencing the garden is the measure of perimeter of the garden and length and width of the rectangle are given, we find the perimeter of rectangle which is 2*width +2*length=2*20+2*40=40+80=120 feet of fence are needed.