CLASS-8
CHORD & DIAMETER OF A CIRCLE

Chord of a Circle –                                                 

A line segment joining two points on a circle is called a chord of the circle. 

In the figure, PQ, PR, and PS are chords of the circle. In the figure, PQ, PR, and PS are chords of the circle

Diameter Of The Circle –

A chord that passes through the center of the circle, is called a diameter of the circle. In the figure above, PQ is a chord passing through the center ‘O’. so the line segment PQ is the diameter of the circle. The length of the line segment PQ is also called the diameter of the circle. In other words, the diameter is the length of the longest chord of a circle.

Now, PQ = PO + OQ =  radius + radius =  2 X radius

Therefore,                

                    Diameter

     Radius =  ------------- ,    Diameter = 2  X  radius

                        2