If the radius is 1, the diameter is 2, and the circumference is about 6.28. Since the area of a circle is πr^2, a circle with r=1 would have an area of π.
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Diameter = 1/2 of the circle's radius. Diameter = 2 times the square root of (the circle's area/pi) Diameter = the circle's circumference/pi
Radius of the circle: 6.28/2*pi = 0.999 mm or about 1 mm
Oh, dude, you're hitting me with some math here! So, the circumference of a circle is calculated using the formula C = 2πr, where r is the radius. Since the circle is 1 meter round, the radius is 0.5 meters. Plugging that into the formula, you get C = 2π(0.5) = π meters, or about 3.14 meters. So, like, the circumference of a 1 meter round circle is approximately 3.14 meters.
The circumference of an 8-inch circle is: 25.1 inches.
Circumference = 2 x pi x radius. If you want an estimate, you can round some of the numbers involved - either the radius, or pi, or both.