A circle can be drawn using a **pair of compasses**.

The distance set between the point and the pencil tip is called the **radius**.

The point marks the **centre **of the circle.

The distance straight across from one edge to the other, going through the centre, is called the diameter.

The **diameter **is **twice **as long as the **radius**.

The **radius **is **half **the length of the **diameter**.

When we draw a circle, the pencil line around the perimeter is called the **circumference**.

It is a curved line.