AIR MATH

Math Question

The circumference of a circle is \( 18 \pi \) centimeters. What is the area of the circle in terms of \( \pi \) ? (A) \( 9 \pi \mathrm{cm}^{2} \) (B) \( 18 \pi \mathrm{cm}^{2} \) (C) \( 324 \pi \mathrm{cm}^{2} \) (D) \( 81 \pi \mathrm{cm}^{2} \)

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