CENTRE : O
RADIUS : OA
In a plane,each point of the circle is at equal
distance from a fixed point.The fixed point is
called the centre of the circle.
CENTRE = O
The distance from centre to any point on the
circle is called radius of the circle.
RADIUS = OA
A Line segment passing through the centre of
the circle and whose end points lie on the circle
is called the diameter of the circle.
DIAMETER = AB
The length of the circle or the distance
around it is called circumference of the
A Line segment whose both the ends touches
the circumference and passes through the
centre is called diameter.
DIAMETER : AB
Relation between radius and diameter
RADIUS = DIAMETER
OB = AB
Eg. If diameter of the circle is 10 cm then find
Sol. Radius =diameter / 2
radius=10 cm/ 2
radius =5 cm
Diameter = 10cm B
Eg. If radius of the circle is 6 cm,then find the
diameter of the circle?
Sol. Diameter = 2 x Radius
Diameter = 2 x 6cm
Diameter = 12 cm
Radius = 6cm
RELATION BETWEEN CIRCUMFERENCE AND
CIRCUMFERENCE = 3 x DIAMETER(APPROX)
Eg. Find the circumference (approx) of the circle whose
diameter is 10cm.
Sol. Circumference = 3 x
Circumference = 3 x 10 cm
Circumference = 30 cm
1. what is the relation between radius and diameter of the
2. What is the relation between circumference and diameter
of the circle?
3. In this figure
OA or OB is ______. A .
AB is ________.
O is _________.
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