3. LOCUS OF A POINT WHOSE DISTANCE
FROM A FIXED POINT IS CONSTANT.

4. CHORD
A LINE SEGMENT JOINING TWO
POINTS ON A CIRCLE.

5. DIAMETER
A STRAIGHT LINE DRAWN THROUGH THE
CENTRE OF ACIRCLE. IT IS DENOTED AS “d”

6. RADIUS OF A CIRCLE
HAIF OF THE DIAMETER.
 d=2r; where “ r” is the
radius of the circle
.