The diameter of a round coin is 27.9 millimeters. What is the approximate area of one face of the coin?

A. 100 mm2

B. 200 mm2

C. 600 mm2

D. 300 mm2

so you would do half of the diameter which is 13.95 (radius)

A = pi times radius squared

so it would be A = (pi) 13.95 squared the answer is about 611 so C would be the correct answer