# How to find the circumference of a circle

The circumference of a circle is the length of its
boundary, it cannot be determined with the help of a scale-line. This is
attributable to the fact that a circle is a curvy figure. Therefore, we
calculate the circumference of the circle with the help of the circumference
formula.

Circumference of a circle=π
diameter

C=π×d

**Example**: What is the circumference of a circle whose
diameter is 13 units?

**Solution**: Given diameter = 13 units

Let us use the circumference formula and substitute
the value of diameter in it.

Circumference of circle formula=π×d

C=π×d

C=3.14×13

C=40.82 units

Hence, the circumference of a circle is 40.82 units.

**Problem**: Lauren is planning a trip to London and wants to
ride the London Eye, the world's most famous Ferris wheel. She discovers the
radius of the circle measures around 78 meters while investigating details
about the enormous Ferris wheel. What is the Ferris wheel's estimated
circumference? As a rough estimate of pi, use 3.14.

**Solution**:

The Ferris wheel has a radius = of 78 m

Ferris wheel’s circumference = ?

Using circumference formula

Circumference of
ferries wheel = 2 π
r

C =3.14

C= 489 m

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