24 mm. The diameter is twice the radius.
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9 mm
Diameter = 2 x radius = 18 mm .
9 mm
A circle with a radius of 50 mm has an area of 7853.98 square mm
Well, honey, if the diameter of a circle is 7 mm, then the radius is half of that, which is 3.5 mm. The formula for the area of a circle is πr^2, so plug in 3.5 for the radius and you get an area of approximately 38.48 square millimeters. So there you have it, darling!