Arc, Sector and Circle

 

Circumference of a circle:

C =  2 π r     or      C = π d

where  r is the  radius  and  d is the diameter of the circle

home.avvanta.com

 

 

 

Arc Length of a Sector:

l = Θ/360 × 2 π r

where Θ is the angle subtended at the centre

mathematicsi.com

 

 

Perimeter of a sector:

P = l + 2 r

 

 

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