This is a chord. It is a line segment that joins two points on the circle. This is chord QR. A chord may or may not pass through the center.
A chord that goes through the center of a circle is called its diameter. The diameter is the longest chord of the circle.
The length of the boundary/curved line of the circle is called is called the circumference of the circle. It is called the perimeter of the circle.
Ho to Draw a circle?
To draw a circle you can use different circular objects such as coins, bangles or bottle caps.
You can also use a compass to draw a circle.
To draw a circle P of radius 4 cm, first fix a sharp pencil into the compass such that the compass point and the pencil point are at the same level.