Sector of the circle

 sector - 

sector is an area surrounded by two radii and an arc, as shown is figure.

OA and OB is radius and AxB is arc

Area of sector = 

Perimeter of sector =  

https://www.youtube.com/playlist?list=PLBmAAJV4jp1bS_cT9coruDYn27p2wYPQX

 

 

 

 

 

 

 Contents

1 Definition of circle. 

2 Chord of the circle.

3 Scant of the circle.

4 Radius of the circle.

5 Relation between diameter and radius.

6 Concentric circle

7Area of the circle 

8 Circumference of the circle

Secant of a circle

 Secant of a circle -  A line which meet a circle into two points is called a secant of the circle, in given figure XY is a secant.  

Circumference of circle

 

Circumference of circle- length of the boundary of a circle or perimeter of  a circle is called circumference.

circumference of a circle = 2𝞹r  (where 𝞹 = 22/7 and r = radius)

Area of circle

 

Area of circle 

 Area of circle = 𝞹r²    (where 𝞹 = 22/7 and r = radius)

Relation between diameter and radius

 Relation between diameter and radius-

                diameter = 2 (radius) 

chord of a circle

 

Chord of a circle- Line joining the two points of a circle is called chord.

AB, CD, EF are chords 

Diameter of a circle- A line (chord) that passes through the centre of the circle is called diameter of circle.Diameter is the longest chord.

Radius of the circle

 

Radius of the circle- If we construct a line which join centre of the circle to the any point of boundary (circumference) of the circle. Generally we denote radius by r .

OA,OB. OC OD are radius of circle