To find the area of a circle, we use the formula:
\[ \text{Area} = \pi r^2 \]
where \( r \) is the radius of the circle. Given that the radius \( r \) is 98 mm and using \( \pi \approx 3.14 \):
\[ \text{Area} = 3.14 \times (98)^2 \]
First, calculate \( (98)^2 \):
\[ 98^2 = 9604 \]
Now, substitute this value back into the area formula:
\[ \text{Area} = 3.14 \times 9604 \]
Now, perform the multiplication:
\[ 3.14 \times 9604 = 30103.76 \]
Thus, the area of the circle is:
\[ \text{Area} \approx 30103.76 , \text{mm}^2 \]
Therefore, the area of the circle is:
\[ \boxed{30103.76} , \text{mm}^2 \]