Parts of the Circle

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Centre (C)

The middle point of the circle.

Radius

The distance from the centre to any point on the circle.

Diameter

The longest distance from one end of the circle to the other passing through the centre.

Chord

A line segment connecting two points on the circle.

Secant

A line that intersects the circle at two points.

Tangent

A line that touches the circle at exactly one point.