The formula to calculate the area \( A \) of a circle is given by:
\[ A = \pi r^2 \]
where \( r \) is the radius of the circle.
Given that the radius \( r = 98 \) mm and using \( \pi \approx 3.14 \), we can calculate the area as follows:
\[ A = 3.14 \times (98)^2 \]
First, calculate \( (98)^2 \):
\[ 98^2 = 9604 \]
Now, substituting back into the area formula:
\[ A = 3.14 \times 9604 \]
Now, perform the multiplication:
\[ A = 30109.56 \]
Thus, the area of the circle is:
\[ \boxed{30109.56} , \text{mm}^2 \]