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10.4 Area and Length in
   Polar Coordinates
 Area of a region bounded by the polar curve

                    = (   )
 and by the rays:

                = ,       =




       O
O

Formula:


           =       (   )

or


               =
Ex: Find the area enclosed by one loop of
the four-leaved rose   =       .
Ex: Find the area enclosed by one loop of
the four-leaved rose   =       .


     :
Ex: Find the area enclosed by one loop of
the four-leaved rose   =       .


     :
          /
     =
           /
Ex: Find the area enclosed by one loop of
the four-leaved rose   =       .


     :
          /
     =
           /

          /
    =
           /
Ex: Find the area enclosed by one loop of
the four-leaved rose   =       .


     :
          /
     =
           /

          /
    =
           /


    =
Ex: Find the are of the region that lies inside
the circle  =          and outside the
cardioid    = +         .
Ex: Find the are of the region that lies inside
the circle  =          and outside the
cardioid    = +         .


      :
Ex: Find the are of the region that lies inside
the circle  =          and outside the
cardioid    = +         .


        :
        /
=                   (         )
    /
                /
                        ( +       )
            /
Ex: Find the are of the region that lies inside
the circle  =          and outside the
cardioid    = +         .


        :
        /
=                   (         )
    /
                /
                        ( +       )
            /


=
Arc length of a polar curve   = (   )
between     = ,       =
is given by



          =        +




      O
Ex: Find the length of the cardioid   =   +
Ex: Find the length of the cardioid   =   +




=          +
Ex: Find the length of the cardioid   =   +




=          +



=       ( +        ) +
Ex: Find the length of the cardioid   =   +




=          +



=       ( +        ) +


=

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Calculus II - 18

  • 1. 10.4 Area and Length in Polar Coordinates Area of a region bounded by the polar curve = ( ) and by the rays: = , = O
  • 2. O Formula: = ( ) or =
  • 3. Ex: Find the area enclosed by one loop of the four-leaved rose = .
  • 4. Ex: Find the area enclosed by one loop of the four-leaved rose = . :
  • 5. Ex: Find the area enclosed by one loop of the four-leaved rose = . : / = /
  • 6. Ex: Find the area enclosed by one loop of the four-leaved rose = . : / = / / = /
  • 7. Ex: Find the area enclosed by one loop of the four-leaved rose = . : / = / / = / =
  • 8. Ex: Find the are of the region that lies inside the circle = and outside the cardioid = + .
  • 9. Ex: Find the are of the region that lies inside the circle = and outside the cardioid = + . :
  • 10. Ex: Find the are of the region that lies inside the circle = and outside the cardioid = + . : / = ( ) / / ( + ) /
  • 11. Ex: Find the are of the region that lies inside the circle = and outside the cardioid = + . : / = ( ) / / ( + ) / =
  • 12. Arc length of a polar curve = ( ) between = , = is given by = + O
  • 13. Ex: Find the length of the cardioid = +
  • 14. Ex: Find the length of the cardioid = + = +
  • 15. Ex: Find the length of the cardioid = + = + = ( + ) +
  • 16. Ex: Find the length of the cardioid = + = + = ( + ) + =

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