WHAT IS A CIRCLE? A CIRCLE IS A CLOSED CURVE IN A PLANE. A Circle can be drawn with the help of a circular object. For Eg . A circle drawn with the help of coin
C entre of a circle A circle is a closed curve consisting of all points in a plane which are at the same distance from a fixed point inside it. This fixed point inside a circle is called Centre. A circle has one and only centre
Radius A line segment that joints any point on the circle to its centre its called a radius. Radius of a circle are equal in length. Infinite number radius can be drawn in a circle.
Diameter A line segment that joins any two points on the circle and passes through its centre is called a diameter. Infinite number diameter can be drawn in a circle. The Length of the diameter of the circle is twice the length of its radius.
Chord A line segment that joins any two points on a circle is called a chord. Diameter is also a chord of a circle. Diameter is the longest chord. Infinite number of chords can be drawn in a circle.
ARC An arc is the distance between any two points on the circumference of a circle.
Sector The plane surface that is enclosed between two radii and the circular arc of a circle is called a Sector.
SEGMENT Each part of a circle which is divided by a chord is called a segment. The part which has a smaller arc is called as a minor segment. The part which has a larger arc is called as a major segment.