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To find the area of a circle, you can use the formula:
\[
\text{Area} = \pi r^2
\]
where \( r \) is the radius of the circle. Since the diameter of the circle is 10 millimeters, the radius is half of that:
\[
r = \frac{10}{2} = 5 \text{ mm}
\]
Now, using \( \pi \approx 3.14 \), we can calculate the area:
\[
\text{Area} = 3.14 \times (5)^2 = 3.14 \times 25 = 78.5 \text{ square mm}
\]
Therefore, the area of the circle is **78.5 square mm**.