The document defines and describes the key parts of a circle, including the radius, diameter, chord, arc, segment, semicircle, secant, and tangent. It provides definitions for each part and examples. The teaching points cover the circle itself as well as its parts. Students will learn to recall, explain, draw, and analyze circles and their components. An evaluation with fill-in-the-blank questions is also included to assess understanding.

1. By Vinay

2. Knowledge : Student will able to recall the circle and its
parts.
Understanding :Student will able to explain the parts of
circle like diameter , chord , segment , etc.
Skill :Student will able to draw the circle and its parts.
Application : Student will able to analyse things which are
in circle shape.

3. Teaching points
1. Circle
2. Parts of Circle
 Radius
 Diameter
 Chord
 Concentric
circles
 Arc
 Segment
 Semicircle
 Secant and
Tangent

4. CIRCLE
Definition : A circle is set
of points in plane that are
equidistant from a given
fixed point in plane.
Thus , a circle is path
traced by point in a plane
which moves such that its
distant from fixed point in
plane is a constant. The
fixed point is called centre.
Centre

5. A circle
Examples

6. PARTS OF CIRCLE
1. Radius
Definition : A radius of a circle
is a line segment joining the
centre to any point on the circle .
Infinite number of
radius can be drawn in a circle .
Radii of circle are equal in
length.

7. 2. Diameter
Definition : A diameter of a circle is line segment that joints any
points on the circle and passes through its centre.
Infinite number of diameters can be drawn in a circle an
are equal in length.

8. 3.Chord
Definition : A line segment that joins any two points on the
circle is called chord .
Diameter is also longest chord of the circle . Infinite number
of chords can be drawn.
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C D
M
N
K
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9. 4.Arc
Definition : An arc of a circle is a
part of circle included between
two distinct points of the circle.
Any chord other than the
diameter divides the
circumference into two unequal
parts , two unequal arcs.
The larger arc is called major arc
and the smaller one is called
minor arc.
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Centre
LK
X
Y
The longest arc of circle which forms the circle is called
circumference

10. 5 Segments of a circle
Definition : A chord divides the
circular region into two parts,
each of which is called a
segment of circle.
The segment that contains
centre inside is called major
segment . The segment doesnot
contain the centre is called
minor segment.

11. Definition : The diameter of a circle divides it into
two equal halves and each half is called semicircle.

12. Definition : A line that intersects a circle in two distinct points is
called a secant.
Definition : A line that just touches circle atone point at outside
is called tangent.

13. Definition : Two or more circles in same plane are called
concentric circles if they have same centre.
Concentric Circles
..
Video

14. Evaluation
Fill in the blanks with suitable answers.
1. The fixed point is called
2. Line joining centre to any point on the circle is called
3. is the longest chord of circle.
4. The larger arc is called
5. The longest arc of circle which forms the circle is called

15. Answers
1. Centre.
2. Radius.
3. Diameter.
4. Major arc.
5. Circumference.