1. WELCOMEWELCOME

2. PRESENTED BY,PRESENTED BY,
VINEETHA WILSONVINEETHA WILSON
REG.NO:13973020REG.NO:13973020
MATHEMATICSMATHEMATICS
KERALA UNIVERSITY COLLEGE OFKERALA UNIVERSITY COLLEGE OF
TEACHER EDUCATION, KOLLAM.TEACHER EDUCATION, KOLLAM.

3. NAME OF THE TEACHER:VINEETHA WILSONNAME OF THE TEACHER:VINEETHA WILSON
STANDARD : IXSTANDARD : IX
SUBJECT : MATHEMATICSSUBJECT : MATHEMATICS
TOPIC : CIRCLESTOPIC : CIRCLES

4. CIRCLESCIRCLES

5. DEFINITION
 A Circle is a closed curve consisting of
all points in a plane which are at the
same distance

6. CENTRE
 The fixed point (equidistant) inside a
circle is called centre. A circle has one
and only one centre.

7. CIRCUMFERENCE
 The distance around a circle is
called its circumference

8. RADIUSRADIUS
 A line segment that joins any
point on the circle is to centre is
called a radius.

9. DIAMETER
 A line segment that joins any
two points on the circle and
passes through its centre is
called a diameter

10. CHORD
 A line segment that joins any
two points on the circle is called
a chord.
 The diameter is the longest
chord.

11. ARC
 An arc is the distance between
any two points on the
circumference of a circle.

12. SEMICIRCLESEMICIRCLE
 Half of a circle is called a
semicircle. A semicircle is also
an arc of the circle.

13. Equation of circumference ofEquation of circumference of
a circlea circle
 Circumference of a circle is 2∏r
where r is the radius of the
circle and the value of ∏ is 3.14
or 22/7

14. Equation of Area of a circleEquation of Area of a circle
 Area of circle is ∏r2 where r is the
radius and the values of ∏ is 3.14

15. THANK YOUTHANK YOU