What is a Circle ?
A circle is a simple closed curve and is not considered as a polygon.
Parts of Circles
1. Radius – It is a straight line connecting the centre of the circle to the boundary of the same. Radii is the plural of ‘radius’.
2. Diameter –It is a straight line from one side of the circle to the other side passing through the centre.
3. Circumference – It refers to the boundary of the circle.
4. Chord - Any line that connects two points on the boundary of the circle is called Chord. Diameter is the longest chord.
5. Arc – It is the portion of the boundary of the circle.
6. Interior of the Circle – Area inside the boundary of the circle is called the Interior of the Circle.
7. The Exterior of the Circle – Area outside the boundary of the circle is called the Exterior of the Circle.
8. Sector- It is the region in the interior of a circle enclosed by an arc on one side and a pair of radii on the other two sides.
9. Segment - It is the region in the interior of the circle enclosed by an arc and a chord.
What is a Semi-circle ?
