3. Teaching Points are -
1. CIRCLE
2. PARTS OF A CIRCLE
 Centre
 circumference
 Radius
 Diameter
 Chord
 Arc
 Semicircle
3. RELATION B/W DIAMETER & RADIUS

4. What is an Circle?
The word circle comes from the Latin word “ CIRCULUS”
which means disc.
A circle is set of points in a plane that are equidistant from a
given fixed point.
The fixed point is called the centre of the circle.
A circle has an interior as well as exterior region.

5. Parts of a circle
Centre
The point at which we place
the needle end of the compass
and move the pencil around it
is the centre of the circle.

6. Circumference
The length of the boundary of
the circle is the circumference
of the circle.
In other words, it is the
perimeter of the circle.

7. Radius
The line segment joining the centre
to any point on the circle.
* Infinite number of radius can
be drawn in a circle.
* All the radii of a circle are
equal in length.

8. Diameter
A diameter of a circle is line
segment that joins any two
points on the circle and passes
through its centre.
Infinite number of diameters
can be drawn in a circle and all
are equal in length.

9. Chord
A line segment that joins any two
points on the circle is called chord.
Infinite number of chords can be
drawn.
Diameter is the longest chord of a
circle.

10. Arc
An arc of a circle is a part of circle
included between two distinct
points of the circle.
The larger arc is called MAJOR
ARC and the smaller arc is called
MINOR ARC.

11. Semicircle
The diameter of a circle divide it
into two equal halves and each half
is called semicircle.

12. Concentric Circles
Two or more circles in same plane are called
concentric circles if they have same centre.

13. Relation Between Radius and Diameter

14. Thank
You