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Summary

S. N.  Figure  Name  Area in sq. units Perimeter  Nomenclature
1. Circle  πr2  2π

r = radius
d = 2r = diameter

2. Sector of the 
circle
 
(or)

lr
l + 2r 

 

θ = angle of the  sector 
r = radius,
l = length of the  sector arc
3. Semicircle  ½ πr2  πr + 2r r = radius
4. Segment of a circle (shaded)  r = radius,
  θ = angle of the sector
5. Ring  (shaded 
portion) 
π(R2 - r2) 2π(R - r) R=outer radius
 r=Inner radius




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