Definition of terms

Definition of Terms

Circle: A circle is the locus or the set of all points equidistant from a fixed point called the centre.

Arc: A curved line that is part of the circumference of a circle.

Chord: A line segment within a circle that touches two points on the circle.

Circumference: The distance around the circle.

Diameter: The longest distance from one end of a circle to the other.

Centre: The fixed point from which all points on the circle are equidistant.

Pi (π): A number, approximately 3.141592, equal to the circumference divided by the diameter of any circle.

Radius: The distance from the centre of a circle to any point on it.

Sector: A region of a circle bounded by two radii and the arc between them, like a slice of pie.

Tangent: A line that is perpendicular to the radius and touches only one point on the circle.

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Note: Diameter = 2 × Radius

Circumference of circle = π × diameter = 2π × radius