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Diameter
01
a straight line from one side of a round object, particularly a circle, passing through the center and joining the other side
Example
The diameter of a circle is the longest distance between any two points on its circumference, passing through the center.
To calculate the circumference of a circle, you need to know its diameter and use the formula π × diameter.
02
a straight line connecting the center of a circle with two points on its perimeter (or the center of a sphere with two points on its surface)