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The length around a circle is the circumference The length across a circle is the diameter
The radius of a circle is the length of the line from the center of the circle to any point on its edge.
The diameter of any circle is twice its radius
A chord of a circle is a straight line that joins any two points on the circumference of a circle. The diameter of a circle is the length of the chord that passes through the centre of the circle; it is the chord of longest length and is twice the radius of the circle in length.
If the circle is 11 inch in diameter, then the length of the circle is 69.1 inches, however if the 11 inches is the circumference, then the length is 11 inches.