Kris wants to fence in her square garden that is 40 feet on each side. If she places posts every 10

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Kris wants to fence in her square garden that is 40 feet on each side. If she places posts every 10 feet, how many posts will she need?

Perimeter (P) of a square with side s:
P = 4s

Given s = 40, we have:
P = 4(40)
P = 160 feet

160 feet / 10 foot spaces = 16 posts