it contains some theorems of circles

3. •A circle is the collection of all points in
the plane, which are equidistant from a
fixed point in the plane.
• A circle is a plane figure.
• Euclid discovered the circle.
•The fixed point is called the centre of
the circle
• The fixed distance is called the radius
of the circle.
• The longest chord of the circle is the
diameter of the circle.

4. If the length of two chords
are equal then their
distance from centre is
also equal.

9. D
O
A
C
B

10. O is the centre.
AB and CD are two equal chords.
Angle AOB = Angle COD

11. In AOB and COD
AO = CO (Radius of
circle)
AB = CD (Given)
OB = OD (Radius of
circle)
By SSS Congruence rule,
AOB is congruent to COD
By c o r r e s p o n d i n g p a r t o f
c o n g r u e n t t r i a n g l e
A n g l e A OB = A n g l e COD

12. Harsha Detani 9031
Dimple Tak 9024
Nikita Soni 906
Harshita Tomar 2
903
5
Heena Detani 903
Kriti Singhal 6
904