5. A circle can be drawn with the help of a circular object.
For example: A circle drawn with the help of a coin.
A circle is a closed curve in a plane.
6. A circle is a
closed curve
consisting of all
points in a plane
which are at the
same distance
(equidistant) from
a fixed point
inside it.
CentreO
This fixed point (equidistant)
inside a circle is called
centre.
A circle has one and only
one centre.
7. is called a radius.
M
A point on the circle
A line segment that joins any point on the circle to its centre
Centre
O
(Contd…)
8. K
Centre O
L
Radii ( plural of radius) of a circle are equal in length.
Infinite number of radius can be drawn in a circle.
M
N
(Contd…)
9. A
A circle
O Centre
B
A line segment that joins any two points on the circle and
passes through its centre is called a diameter.
(Contd…)
11. Radius OM
Centre
M
O
N
Radius ON
Diameter MN
Radius OM = Radius ON
Diameter MN = Radius OM + Radius ON
The length of the diameter of a circle is twice the length of its
radius.
(Contd…)
12. A line segment that joins any two points on the circle is
called a chord.
O
A
A is a point on the
circle
B is another point
on the circle
B
18. K
C
O
Centre
C
It is a line that intersects the circle at exactly one
point on the circle. This point is called Point of
Tangency.
Point of
Tangency
19. O
Centre
An arc is the distance between any two points on the
circumference of a circle.
K L
(Contd…)
20. O
Centre
L
K
An arc is named by three points, of which two are the end
points of the arc and the third one lies in between them.
X
Naming an arc
Arc KXL
(Contd…)
21. L
X
Minor Arc KXL
K
O
Centre
Major Arc KYL
Y
An arc divides the circle into two parts: the smaller arc is
called the minor arc, the larger one is called the major arc.
(Contd…)
23. Half of a circle is called a semicircle.
O
Centre
Diameter
D E
S
A semicircle is also an arc of the circle.
R
(Contd…)
Semicircle DSE
Semicircle DRE
32. 1. The distance between any
two points on the
circumference of a circle.
2. A line segment that joins
any two points on a circle.
3..The line segment that joins
any two points on the
circle and passes through
its center.
4. Line segment that joins any
point on the circle to its
centre .
5. Line that intersects the
circle at any two point on
the circle.
6. line that intersects the circle
at exactly one point on the
circle
Direction: Fill in the box
the answers of its
corresponding statements
shown on the right.
Hint: The last letter of the
answer will be the first
letter of next answer.
33. Across:
1. the distance between any
two points on the
circumference of a circle.
2. A line segment that joins
any two points on a circle.
3..The line segment that joins
any two points on the
circle and passes through
its center.
4. Line segment that joins any
point on the circle to its
centre .
5. Line that intersects the
circle at any two point on
the circle.
6. line that intersects the circle
at exactly one point on the
circle
A
Direction: Fill in the box
the answers of its
corresponding statements
shown on the right.
Hint: The last letter of the
answer will be the first
letter of next answer.