basics of circles-centre,radius,diameter,chord,arc,sector,segment,secant&tangent

2. A circle is the set of all
points in a plane that are the
same distance from a given
point, called the center of a
circle.

4. RADII IS THE
PLURAL OF RADIUS.
RADII IS THE
DISTANCE FROM THE
CENTRE TO THE
CIRCUMFERENCE.
RADII OF A CIRCLE

5. DIAMETER OF A CIRCLE
DIAMETER IS THE LONGEST
CHORD.
DIAMETER IS A STRAIGHT LINE
JOINING TWO POINTS ON A CIRCLE
AND PASSING THROUGH THE
CENTRE.

6. CHORD OF A CIRCLE
A CHORD IS A STRAIGHT LINE
JOINING TWO POINTS ON A
CIRCUMFERENCE OF A
CIRCLE.

7. An arc is the part of the
circumference.

9. A segment is the part of a
circle between a chord and
an arc.

10. A secant is a straight line
which touches a circle at two
points.

11. A tangent is a straight line which
touches a circle at only one point.
Tangent is perpendicular to the
radius through the point of
contact.