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Pi times the diameter of a circle gives its circumference.
In everyday use, the term "circle" may be used interchangeably to refer to either the boundary of the figure (known as theperimeter) or to the whole figure including its interior. However, in strict technical usage, "circle" refers to the perimeter while the interior of the circle is called a disk. The circumference of a circle is the perimeter of the circle (especially when referring to its length)
Circumference of circle: 4*pi = 12.566 cm to 3 decimal places
Circumference
A perimeter is the distance around two-dimensional shapes. The circumference is the distance around a circle. Typically the distance around polygons is a perimeter and circumference is used for closed curves.