Important Formulas related to a Circle

      

    Area of circle = πr²

    

    Perimeter of circle = circumference = 2 πr

      Area of ring = πR² – πr²

      Length of arc = x⁰/ 360 × 2 πr

      Area of sector = x⁰/ 360 × πr²

      Perimeter of sector = length of arc + 2 radius

      Area of segment = Area of sector – area of triangle

      1 revolution (in terms of angle) = 360⁰

      1 revaluation( as a distance) = circumference= 2 πr  

 

                                                      By: Sir Baqar Ali