Circle and it’s properties

Introduction

A circle is a simple, beautiful and symmetrical shape. When a circle is rotated through any angle about its centre, its orientation remains the same. When any straight line is drawn through its centre, it divides the circle into two identical semicircles. The line is known as the diameter. The common distance of the points of a circle from its centre is called radius. The perimeter or length of the circle is also known as the circumference.

Diameter

The diameter of a circle is the length of a line segment whose endpoints lie on the circle and which passes through the centre of the circle.
This is the largest distance between any two points on the circle.
The diameter of a circle is twice its radius.
In other words, two radius make one diameter.

Chord

A chord of a circle is a line segment whose two endpoints lie on the circle.
The diameter, passing through the circle’s centre, is the largest chord in a circle.

Tangent

A tangent to a circle is a straight line that touches the circle at a single point.

Secant

A secant is an extended chord: a straight line cutting the circle at two points.

Arc

An arc of a circle is any connected part of the circle’s circumference.

Sector

A sector is a region bounded by two radius and an arc lying between the radius.

Segment

A segment is a region bounded by a chord and an arc lying between the chord’s endpoints.