We know that the constant distance is radius of a circle.
The line segment joining the centre to any point on the circle has constant distance.
∴ Line segment joining the centre to any point on the circle is a radius of the circle.
In a circle, infinitely many diameters can be drawn.
A diameter is the longest chord.
∴ a circle has infinitely many chords.
When a circle is divided into three equal parts, each part will be less than a semicircle.
We know that diameter is twice the radius i.e. d = 2r.
∴ A chord of a circle, which is twice as long as its radius is a diameter of the circle.
A circle is drawn on a plane which divides it into three parts.
∴ A circle is a plane figure.
The collection of those points in a plane, which are at a fixed distance from a fixed point in the plane, is called a circle.
We know that if any chord passes through the centre of the circle then it is called the diameter of the circle.
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