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Let the radius of the circle be r [m].

area of the circle = pi * r^2

circumference = 2 * pi * r

given: pi * r^2 = 28 [m^2]

Therefore, r = square root of (28/pi) = 2.99 [m].

circumference = 2 * pi * 2.99 = 18.76 [m]

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