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The circumference of the circle is calculated through the equation, C = 2πr. From this, the radius is calculated by,
                                       r = C / 2π
Substituting the known values,
                                      r = 8π /2π = 4
The area of a circle is,
                                      A = πr²
Substituting,
                                     A = π4² = 16π units²
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