A 4 mm circle would have a diameter of 4 millimeters, meaning the distance across the circle passing through its center would be 4 mm. This circle would be relatively small, about the size of a standard pencil eraser. In terms of area, the circle would cover approximately 12.57 square millimeters.
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The diameter of a circle that has a circumference of 113 mm is about 35.97 mm
A circle with a radius of 50 mm has an area of 7853.98 square mm
The circumference of the circle with a diameter of 64 mm is 64*pi = about 201 mm
188.40 mm
9 mm