Multiply each of the diameters by pi (pi = 3.14159265 or 3.14 for rough approximation) to find the circumferences of the circles.
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Using the Circumference And Area.
You need to know diameter of each circle, which are different for each circle; each circle circumference is pi x diameter where pi = 3.14159
For any circle in a plane, the ratio of circumference to diameter is a number called pi, approximately 3.14.
If the circle touches each edge of the square then its diameter is the same as the side of the square and its circumference is pi times the diameter.
You neglected to say whether the 4mm is the radius of the circle, or the diameter,or the circumference. Each possibility gives you a different area.