Question

write the relation between circumference of diameter of circle

Answer 1

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Circles are all similar, and "the circumference divided by the diameter" produces the same value regardless of their radius. This value is the ratio of the circumference of a circle to its diameter and is called π (Pi).

Or

TT (often written pi) is a mathematical constant whose value is the ratio between circumference and diameter of any circle in a Euclidean space, is the same value as the ratio of area of a circle and square of its radius. pi=2*pi*R/2*R, where 2*pi*R=circumference of any circle and 2*R=D=diameter of any circle.
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Answer 2

$\huge{\textbf{ANSWER}}$

We know

Radius = Diameter/2

The relation between diameter (d) and Circumference is

Circumference - 2πr

>> 2π (d/2)

>> πd