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The circumference of a circle is calculated using the formula: C = 2Ï€r, where r is the radius of the circle. In this case, the diameter of the play mat is 6 ft, so the radius would be half of the diameter, which is 3 ft.
Using the formula and π = 3.14, we have:
C = 2 * 3.14 * 3
C = 18.84 ft
Rounded to the nearest hundred, the circumference of the play mat is 19 ft.