It is the name given to the straight line from the centre of a circle to its circumference when that distance is 18 mm.
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The radius of a circle is always half of the distance of the diameter. If you have a 24 mm diameter - then the radius would be 12 mm.
A circle with a radius of 15.5 mm has a circumference of 97.39 mm.
Well, darling, the circumference of a circle is calculated using the formula C = 2πr, where r is the radius. Plug in the radius of 4 mm, and you get a circumference of 8π mm, or approximately 25.13 mm. So, there you have it, sugar, the circumference of a circle with a radius of 4 mm.
13 mm. The radius of a circle is 1/2 of the diameter.
A sphere with a radius of 74.9 mm has a volume of 1,760,086.7 mm3