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!
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Diameter of a circle is pi times the square of its radius. For a circle having a diameter of 7 mm, area = pi (3.1416) x 3.5 mm x 3.5 mm = 38.5 square millimeters.
A circle with a diameter of 7 inches has an area of 38.48 square inches.
A circle with a 7 inch diameter has an area of 38.48451.
A 7-meter diameter circle has an area of 38.5 square meters.
The area is 38.485 square meters.
A circle with a radius of 7 meters has an area of 153.94 square meters.