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A circle is a two-dimensional figure with no corners and edges. It is a simple closed curve but not a polygon.
Parts of the circle:
Centre:
The fixed point in which the circle is described is called the centre of the circle.
Radius:
The line segment joining any point on the circle with its centre is the radius of the circle.
Chord:
A line segment joining two points on a circle is called a chord.
Diameter:
The chord of a circle passing through the centre is called the diameter of the circle. It is twice the length of the radius.
Circumference:
The distance around the circle is its circumference.
Arc:
Any portion of the circumference of a circle is called an arc. It is denoted using the symbol ""
Sector:
The plane surface enclosed between two radii and the circular arc of a circle is called a sector of a circle.
Segment:
The region enclosed by the chord and an arc is called the segment of the circle.
Semicircle:
The diameter of the circle divides into two semi-circles. Thus, the semicircle is half of the circle.
Interior of the Circle:
The area within the boundary of the circle.
Exterior of the Circle:
The area outside the boundary of the circle.
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