SOLUTION: mary knows that the peimeter of a square is 12 inches. she knows that three of the sides are 3 inches lomg. Hoe long is the 4th side?

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Question 1028074: mary knows that the peimeter of a square is 12 inches. she knows that three of the sides are 3 inches lomg. Hoe long is the 4th side?
Answer by fractalier(6550) About Me  (Show Source):
You can put this solution on YOUR website!
The perimeter is the sum of all four sides. Three sides of 3 inches sum to 9 inches. Thus the missing 4th side must also be 3 inches.
It is a square, after all.