chapter-5
I’m Up and Down, and Round and Round:-
(The circle)
Definition of Circle:-
Defn:- A circle is a set of points which are equidistant from a point called center.
or
The locus of points that equidistant from a given point.
Chord :-
A chord is the line whose two ends lies on the circle.
Ex — AB CB are chords here.
Diameter :-
Diameter is the chord which goes through the center of the circle.
⇒ It is the longest chord.
⇒ Ex- Here AB is the diameter of circle S.
Radius :-
The half of diameter is called radius.
or
The line segment joint center and any place on the circle is called radius.
⇒ Ex – OC, OB & OA are three radius of circle S.
⇒ Radius (r) = Diameter (d) 2
Symmetry of Circle :-
Any line that crosses the center breaks the circle into two equal halves.
(Symmetry of circle)
(non-symmetrical)
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