Slide1:
MATHEMATICS
STANDARD: VI Bombay Cambridge Gurukul Bombay Cambridge Gurukul CircleSlide2:
Circle in daily life
Circle in music
Circle in sports Circle
Centre
Circumference
Circular region
Radius
Diameter
Chord
Arc
Semicircle
Segments of a circle
CrosswordSlide3:
A circle BACKSlide4:
BACKSlide5:
Five rings in the logo of Olympic games BACK A circleSlide6:
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. BACKSlide7:
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. O Centre A circle A circle has one and only one centre. BACKSlide8:
The distance around a circle is called its circumference. O Centre A circle A BACKSlide9:
A circle divides a plane into three parts. 2. Interior of a circle 3. Exterior of a circle A plane The interior of a circle together with its circumference
is called the circular region. BACKSlide10:
Radius A line segment that joins any point on the circle to its centre is called a radius. M A point on the circle (Contd…)Slide11:
Radii ( plural of radius) of a circle are equal in length. Infinite number of radius can be drawn in a circle. Radius Centre K O L M N (Contd…) BACKSlide12:
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 (Contd…)Slide13:
A circle O M Infinite number of diameters can be drawn in a circle. As the radii of a circle are equal in length, its diameters too
are equal in length. B Q (Contd…) P A NSlide14:
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 (Contd…) BACKSlide15:
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 ChordSlide16:
Diameter is also a chord of the circle. O Chord CD C D M N K L Chord MN Chord KL (Contd…) Diameter CDSlide17:
The diameter is the longest chord. O Diameter CD C D M N Chord MN (Contd…) C D M N Chord KL L KSlide18:
L K M N Chord MN Infinite number of chords can be drawn in a circle. Chord KL Chord GH G H BACKSlide19:
An arc is the distance between any two points on the circumference of a circle. (Contd…)Slide20:
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. Naming an arc (Contd…) Arc KXLSlide21:
X 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…)Slide22:
An arc An arc BACKSlide23:
Half of a circle is called a semicircle. Centre O Diameter D E S A semicircle is also an arc of the circle. R (Contd…)Slide24:
E Diameter Semicircular region Semicircular region The diameter of a circle divides it into
2 semicircular regions. D BACKSlide25:
A chord divides the circular region into 2 parts, each of which is called a segment of the circle. Centre O D E Chord DE Minor segment of a circle Major segment of a circle S R (Contd…)Slide26:
D E Chord DE Minor segment of the circle Major segment of the circle P Q The part of the circular region enclosed by a minor arc and
the chord is called a minor segment. Minor segment does not contain the centre of the circle. The part of the circular region enclosed by a major arc and
the chord is called a major segment. Major segment contains the centre of the circle. BACKSlide27:
Centre OSlide28:
Radius OM Centre M OSlide29:
Centre E D Diameter DE OSlide30:
Centre Chord PQ P Q O Slide31:
Centre E G O F Slide32:
S Centre O Diameter Semicircle D E SemicircleSlide33:
C 2
C U M F E R N C E A E I Down
1. The distance between any two
points on the circumference of the
circle.
2. The distance around the circle.
3. The distance from the centre of the
circle to a point on the circle.
R D I U S R 1 C 3 R A Across:
4. The line segment that joins any two points on the circle and passes through its centre.
5. A closed curve in a plane.
6. All points on the circle are
equidistant from this point.
7. A line segment that joins any two points on a circle. 4 D A M T E E 5 I R L E 6 C E N T E H R O D 7