6. A circle is a path of
a point moving at
the same distance
from a fixed point.
The fixed point is
the centre.
Line joining the
centre and any
point on the circle
is the radius.
The distance
around the centre is
the circumference.
7. A chord is the line joining any two points in a
circle.
The longest chord is the diameter.
A B
8. A diameter is a chord , which passes the
centre of the circle.
The diameter divides the circle into two equal
parts.
A O B
9. A sector is a region in the interior of the circle
enclosed by an arc on one side and a pair of
radii on the other side.
10. A segment of a circle is a region in the
interior of the circle enclosed by an arc and a
chord.
11. Let, ‘r’ be the radius of the circle,
The area of the circle = πr2
Where π = 3.14
r
12. Circumference of a circle = π x diameter
= 2πr
Where, r= Radius of the circle
r