What is the relationship between the circumference of a circle and its diameter?

diameter is about 3 times the circumference
circumference is about 3 times the diameter
depends on the circle
diameter is half of the circumference

The relationship between the circumference of a circle and its diameter is that the circumference is about 3 times the diameter. This is consistent for all circles as it is a fundamental property of circles defined by the mathematical constant π (pi). The circumference of a circle is equal to π times the diameter.