Question

The circumference of a circle is 18.84 millimeters. what is the circle's area

Answer 1

     Circumference = 2 $\pi$ r 
                   18.84 = 2 $\pi$ r
9.42/$\pi$ = r

Area = $\pi$ r²
         = $\pi$ (9.42/$\pi$)²
         = 9.42²/$\pi$
         = 28.25 mm²²