measure the circumference, c. Since c = pi x d where d = diameter pi = 3.1415926535897932384676..... diameter = circumference / pi
You can measure the diameter, then divide that by 2.
calipers can measure its diameter and check for roundness. Water displacement can measure its volume.
The instrument used to measure the diameter of spherical objects is called calipers.
That is usually calculated on the basis of the diameter, using the formula for a sphere, since stars are usually spherical to a good approximation.
I suggest you measure the DVDs radius (or measure its diameter and divide that by 2). Then you can use the formula for the area of a circle.
Staphylococcus bacteria typically measure about 0.5 to 1.0 microns in diameter. They are spherical in shape, often forming clusters resembling grapes. The length can vary slightly, but they generally do not elongate significantly beyond their diameter.
Lineal feet is a measure of distance in a straight line so I suggest the answer is 14 feet.
Internal diameter.
Internal diameter.
The radius of a circle is half the diameter.
A caliper or a micrometer is typically used to measure curved lines in a laboratory setting. These instruments provide precise measurements of the length or diameter of curved objects such as tubes or spherical surfaces.
Pilots and captains of ship use spherical geometry to navigate their working wheel to move it. They can measure their pathway and destiny by using Spherical Geometry.