Diameter. distasnce from center to edge is radius length around is circumfrance
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The distance around a circle is the circumference. The diameter of a circle is the distance across the center of a circle.
The radius of a circle is half its diameter (the measure of the circle from one side across to the other).
The diameter
Circumference is the outside of the circle and the inside is the are of the circle. And inside of the circle, there is diameter and radius. Radius is from the center point to the edge of the circle and diameter is all the way across.
The diameter (across the widest part) is the longest chord that can be drawn on a circle.