zack rode his bike around the same park square every day. He measured the distance around the square to be 84 meters. What is the area of the park square?

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Since the perimeter of this square is 84, you would divide 84 by 4 to find the length of each side. If you do 84 divided by 4, you would be 21. Then you just multiply 21 by itself because to find the area of a square, you would just square one of the side lengths, so 21 squared is 441.