Class 6 Maths Basic Geometrical Ideas Circles

Circles

A circle is a simple closed curve and it is not a polygon. Below is the image of a circle.

Parts of a Circle

Centre: The center point of the entire circle. Point C is the centre of the circle.

Radius: The line segment that connects the centre of circle to any point on the circle. OC is the radius of the circle.

Diameter: The line segment that connects two points on the circle and passes through the centre of the circle. It is double the value of the radius. AB is the diameter of the circle.

Chord: The line segment that connects two points on the circle but do not pass through the centre of the circle. DE is the chord of the circle.

Circumference: It is the distance around the circle.

Arc: An arc is the part of circumference. DFE is the arc of the circle.

Sector: Sector is an interior region bounded by pair of radii and arc on one side. OBC is a sector of the circle where OB and OC are radius and BC is an arc.

Segment: Segment is an interior region bounded by a chord and an arc.

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