1. CIRCLE STD IX Laxmibai Bhaurao Patil High School,Ahmednagar
Subject Teacher:- Mrs.Zaware Rohini Shrirang

2. Defination of circle A Circle is the locus of points in a plane which are at constant distance from a fix point in that plane

4. Points
Name of the points
In the interior
POINT-D,P,O,X
In the exterior
POINT- M,A,B
On the circle
POINT-R,N,Q

5. DEFINATION OF CIRCULAR REGION
UNION OF CIRCLE AND IT’S INTERIOR IS CALLED CIRCULAR REGION. P

8. Circle geometry Terminology
The following terms are regularly used when referring to circles:
Arc — a portion of the circumference of a circle.
Chord — a straight line joining the ends of an arc.
Circumference — the perimeter or boundary line of a circle.
Radius (r) — any straight line from the center of the circle to a point on the circumference.
Diameter — a special chord that passes through the center of the circle.
A diameter is a straight line segment from one point on the
circumference to another point on the circumference that passes through the center of the circle.
Segment — part of the circle that is cut off by a chord. A chord divides a circle into two segments.
Tangent — a straight line that makes contact with a circle at only one point on the circumference.

9. PROPERTIES OF CIRCLE
THERE IS ONE AND ONLY ONE CIRCLE PASSING THROUGH THREE NON COLLINEAR POINTS. 1
THE PERPENDICULAR DRAWN FROM CENTRE OF CIRCLE TO CHORD BISECTS THE CHORD. 2
CONGRUET CHORDS OF CONGRUENT CIRCLES ARE EQUIDISTANT FROM THE CENTRE 3

10. THANK YOU