3.
Many musical instruments have a circular surface.
For example:
Bingo Drum Tabla
Snare Drum Bass Drum
4.
Five rings in the logo of Olympic games
A circle
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.
This fixed point (equidistant)
inside a circle is called
centre.
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.
OCentre
A circle
A circle has one and only
one centre.
7.
Radius
A line segment that joins any point on the circle to its centre
is called a radius.
M
A point on the circle
CentreO
(Contdâ€¦)
8.
ïƒ˜ Radii ( plural of radius) of a circle are equal in length.
ïƒ˜ Infinite number of radius can be drawn in a circle.
R
adius
Centre
K
O
L
M
N
(Contdâ€¦)
9.
Diameter AB
A line segment that joins any two points on the circle and
passes through its centre is called a diameter.
A
B
A circle
O Centre
(Contdâ€¦)
10.
A circle
O
M
ïƒ˜ Infinite number of diameters can be drawn in a circle.
ïƒ˜ As the radii of a circle are equal in length, its diameters too
B
Q
(Contdâ€¦)
Centre
P
A
N
11.
The length of the diameter of a circle is twice the length of its
radius.
Radius OM
Centre
M
O
N
Radius ON
Diameter MN
Diameter MN = Radius OM + Radius ON
Radius OM = Radius ON
(Contdâ€¦)
12.
A line segment that joins any two points on the circle is
called a chord.
O
B
A
A is a point on the
circle
B is another point
on the circle
A line segment that joins
point A and B
Chord
13.
Diameter is also a chord of the circle.
O
Chord CD
C D
M
N
K
L
Chord MN
Chord KL
(Contdâ€¦)
Diameter CD
14.
The diameter is the longest chord.
O
Diameter CD
C D
M N
Chord MN
(Contdâ€¦)
C D
M N
Chord KL
LK
15.
L
K
M N
Chord MN
O Centre
Infinite number of chords can be drawn in a circle.
Chord KL
Chord
GH
G
H
16.
K
C
O
Centre
Secant KC
KC
It is a line that intersects the circle at any two point
on the circle
line that contains a chord
17.
K
C
O
Centre
Secant KC
KC
X
A
D
Infinite number of secants can be drawn in a circle.
18.
K
C
O
Centre
It is a line that intersects the circle at exactly one
point on the circle. This point is called Point of
Tangency.
C
Point of
Tangency
19.
O
Centre
An arc is the distance between any two points on the
circumference of a circle.
K L
(Contdâ€¦)
20.
O
Centre
LK
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
(Contdâ€¦)
Arc KXL
21.
O
Centre
LK
X
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.
Minor Arc KXL
Major Arc KYL
(Contdâ€¦)
23.
ïƒ˜ Half of a circle is called a semicircle.
Centre
O
Diameter
D E
S
ïƒ˜ A semicircle is also an arc of the circle.
R
Arc DSE
Semicircle DRE
(Contdâ€¦)
Semicircle DSE
Arc DRE
24.
Radius Diameter Chord Arc
Semi
Circle
Centre
O
25.
Radius Diameter Chord Arc
Semi
Circle
Radius O
M
Centre
M
O
26.
Radius Diameter Chord Arc
Semi
Circle
Centre
ED
Diameter DE
O
27.
Radius Diameter Chord Arc
Semi
Circle
Centre
Chord PQ
P
Q
O
28.
Radius Diameter Chord Arc
Semi
Circle
Centre
E
G
Arc PQ
R
O
F
29.
Radius Diameter Chord Arc
Semi
circle
S
Centre
O
Diameter
Semicircle
D E
Semicircle DSE
Semicircle
31.
Secant Tangent
Centre
ED
Diameter DE
O
T
TangentDT
Point of Tangency
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
23 4
5
6
1
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
CHORDIA
M
E
T
E R A D I U S
E
C
ANTANGENT
R
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.