The document defines key terms related to circles such as radius, diameter, chord, arc, segment, and sector. It explains that a circle is the set of all points equidistant from a fixed center point, and the distance from the center to any point on the circle is the radius. The diameter is the longest chord that passes through the center, and is equal to twice the radius. An arc is a piece of the circle between two points, while a segment is the region between a chord and an arc. A sector is the region between an arc and the two radii connecting the arc endpoints to the center.

1. WELCOME

2. CIRCLES AND
RELATED TOPICS

3. Introduction
In our daily life we come across many objects which
are round in shape such as wheels, bangles, coins,
dials of clocks, etc.

4. Circle
Definition
The collection of all points which are at fixed
distance from a fixed point, is called a circle.

5. Circle
Definition
The collection of all points which are at fixed
distance from a fixed point, is called a circle.

6. Circle
Definition
The collection of all points which are at fixed
distance from a fixed point, is called a circle.
The fixed point is called the centre and fixed
distance is called the radius of the circle.

7. Chord and diameter of the
circle
The line joining any two points of the circle is
called the chord of the circle.

8. Chord and diameter of the
circle
The line joining any two points of the circle is
called the chord of the circle.
The chord which passes through the centre is
called the diameter of the circle.

9. Diameter is the longest chord
All diameters have same length
Diameter = 2 * radius

10. Arc
A piece of a circle between two points is called an
arc.

11. Arc
A piece of a circle between two points is called an
arc.
The longer arc is called the major arc and smaller
arc is called the minor arc.

12. Segment
The region between the chord and minor arc is
called minor segment.
The region between the chord and major arc is
called major segment.

13. When P and Q are the endpoints of the diameter,
then both the segments are equal and each is called
semicircle.

14. Sector
The region between the arc and the two radii,
joining the centre to the endpoints of the arc is
called the sector.
Minor arc corresponds to the minor sector and
major arc corresponds to the major sector.

16. Length of the complete circle is called the
circumference of the circle.

17. Thank you