1. Std: 9th
Subject: Geometry

2. Topic: Circle Definition:
A circle is locus of points which are equidistant from a fixed point.
A fixed point is called the Centre of the Circle and the constant distant is called the radius of the circle.
Related terms
Chord of the circle : A line segment joining any two points of the circle is called a Chord of the circle.
Diameter of the circle: A chord passing through the centre of the circle is called Diameter. T N M O P S Q R

3. Secant And Tangent of the Circle
Secant of the Circle: A line which intersects a circle in two distinct points is called a secant.
Tangent of the Circle: A line in the plane of the Circle Which intersects the Circle in only one point is called the Tangent. A B l O l M P

4. Points in a plane of a Circle
A circle is closed curve which divides the plane into three disjoint sets.
Points in the interior of the Circle
Points on the Circle
Points in the Exterior of the
Circle E A D C O B F

5. Circles in a plane
Given two circles in a plane , there arises the following possibilities:
Concentric Circles: Circles having
The same centre and different radii
are called Concentric Circles.
Congruent circles: Circles having the equal radii
are called congruent circles. A B P r Q r A B

6. Intersecting Circles: Coplanar circles having two points in common are called intersecting circles.
Touching Circles: Coplanar Circles intersecting in one point are called Touching Circles. A P Q B B P Q Q P A

7. Thank You

8. Smt. Mhatre Vrushali G. A.P.Bhoir vidyalaya Dapoli –Pargaon.
Presented by,
Smt. Mhatre Vrushali G.
A.P.Bhoir vidyalaya Dapoli –Pargaon.