Parts of a Circle

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Labels for the different parts of a circle are given below

Radius – the radius of a circle is the distance from the centre labelled O to the circumference. The radius is labelled

The circumference of a circle is the perimeter, and is labelled

Diameter – diameter of a circle is the length of a straight line between opposite ends drawn through the centre. The diameter is labelled and is equal to

Tangent – A straight line drawn outside the circle which just touches it.

Chord – a line (not through the centre) drawn between any two points on the circumference.

Arc – a part of the circumference. The length of an arc iswhereis the radius and is the angle in radians.

Sector – the part of a a circle between two radii and an arc. We can divide a circle into major and minor sectors. The area of a sector iswhereis the angle in radians.

Segment – the part of a a circle between chord and an arc. We can divide a circle into major and minor segments.The area of the minor segment on the right iswhereis in radians.

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