I believe the word you're looking for is "diameter".
short for diameter? ... Diameter is the measure of a line across the middle of a circle.
If it is a round speaker, measure straight across the middle of the paper part of the circle (not the metal ring). So a 2" tweeter-type speaker is 2" across the center of the circle. If the speaker is longer than wider you measure across the middle both two directions.
If you measure the middle of the circle and then times it by 3
It is the diameter of the circle or the sphere
the distance across the middle is the radius and whole distance across it is the diameter
The length across the circle. 2 x the radius.
The diameter.
Half the distance across a circle.
It's the diameter.
You are a moron but I'll answer, the diameter is the enitire distance across the circle across the middle point and the radius is the distance from the middle point ot the edge and therefore always half in a perfect circle
The radius of a circle is half its diameter (the measure of the circle from one side across to the other).
you measure across the top of the cylinder if it is a cylinder or across the circle if it is flat