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# Find the ratio of the circumference of a circle to its diameter.

Diameter of a circle is the largest chord that is passing through the centre.

The circumference of a circle is the distance around the boundary of the circle.

## Answer: The ratio of the circumference of a circle to its diameter is π : 1

Let's look into the relationship between circumference of a circle and diameter.

**Explanation:**

Consider a circle with radius 'r' units and diameter 'd' units.

Let the circumference be 'C'

Circumference of a circle is given as,

C = 2 π r

=> C = πd (since, 2r = d) ------------------------- (1)

The ratio of the circumference of a circle to its diameter = C / d

= πd / d (from equation(1))

= π / 1

### Thus, the ratio of the circumference of a circle to its diameter is π : 1

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