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It is a round, closed shape.

**The circumference of a Circle**

The circumference of a circle refers to the distance around the circle.

**Radius:**A straight line from the Circumference till the centre of the circle.**Diameter:**It refers to the line from one point of the Circumference to the other point of the Circumference.**π (pi):**It refers to the ratio of a circle’s circumference to its diameter.

Circumference(c) = π × diameter

**C = πd**

= π × 2r

diameter (d) = twice the radius (r)

d = 2r

**Example**

What is the circumference of a circle of diameter 12 cm (Take π = 3.14)?

**Solution**

C = πd

C = 3.14 × 12

= 37.68 cm

Area of the circle = πr^{2}

**Example**

Find the area of a circle of radius 23 cm (use π = 3.14).

**Solution**

R = 23 cm

π = 3.14

Area of circle = 3.14 × 23^{2}

= 1,661 cm^{2}

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