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Circles
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Farsana . S
BEd. Mathematics
Register number : 13386003
St Thomas Training College.
CIRCLES
o
radius
diameter
A circle has a centre.
The line joining any two points in a circle is the
chord.
The longest chord which passes through the
centre of the circle is diameter.
Radius is half the diameter.
PERIMETER OF A CIRCLE
perimeter = 2 r ; where ≈ 3.14
r = radius of the circle.
AREA OF A CIRCLE
Area of a circle = r² ;where r is the radius
ARC LENGTH
The length of an arc of a circle is that
part of the perimeter of the circle as the central
angle is 360°.
Arc length = x
360 ; where r is the radius
x is the central angle
2 r
SECTOR
It is a part of circle extending to the centre.
AREA OF A SECTOR
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