9th Class Maths Chapter'CIRCLES' Topic Wise Videos

The collection of all the points in a plane, which are at a fixed distance from a fixed point in the plane, is called a circle.

A circle is a closed curve all of whose points lie in the same plane and are at the same distance from the centre.

The fixed point is called the centre of the circle and the fixed distance is called the radius of the circle.

Note : The line segment joining the centre and any point on the circle is also called a radius of the circle.

INTERIOR AND EXTERIOR OF A CIRCLE

A circle divides the plane on which it lies into three parts. They are (i) inside the circle, which is also called the interior of the circle. (ii) the circle and (Hi) outside the circle, which is also called the exterior of the circle

CHORD:

A chord of a circle is a line joining two points of the circumference. A chord passes through the centre is called diameter.

Note : Diameter is the longest chord and all diameters have the same length, which is equal to two times the radius.

A piece of a circle between two points is called an arc. In a circle equal chords have equal arcs

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