A swimming pool measures 36 ft. by 20 ft. How much fencing is needed if the fence is to be built 9 ft. from each side? (Perimeter problem, show and use the formula for a perimeter)

Question

So I multiplied 2 and 9 because it was said 9ft were added to each side of the fence. I then added 18 to each 36 and 20. So I placed the values into the formula like so, 2(36+18) + 2(20+18) = 2(54) + 2(38) = 108 + 76 = 184.

I am not sure if I used the correct formula.

Answer 1

You got the correct answer. Well done! Don't forget the units!

Perimeter = 2×Length + 2×Width

Perimeter = 2×(36+18) + 2×(20+18)

Perimeter = 2×(54) + 2×(38)

Perimeter = 108 + 76 = 184 feet