Matthew finds the diameter of a half dollar to be 30.61 mm in length. If Matthew wants to find the area of the half-dollar, what are the appropriate units for his answer?
A. Mm
B. Cm
C. Cubic mm
D.square mm
If you have a diamter measured in [tex]x[/tex] then an area will be measured in [tex]x^2[/tex] assuming you haven't done any convertions. So the correct answer is square mm in your case. (Answer D)
