Answer:
140 feet.
Step-by-step explanation:
Given that size of the playground is 30 foot by 40 foot.
That means length L = 30 foot
Width W = 40 foot.
Now we need to find the lenght of the fence that is needed for the playground. Fencing is done on the sides of the playground so basically we are going to find the perimeter.
which can be found using formula
perimeter = 2(L+W)
perimeter = 2(30+40)
perimeter = 2(70)
perimeter = 140
Hence total fence needed is 140 feet.
