finding area of rectangle

Now i will teach.how can find area of rectangle
                    so first of all you will know the field is in rectangle form so you can find his area in this method 
first find   the side of rectangle 

then use this formula for rectangle area
                              
                            LxW 
                      where L is the length of rectangle 
                                 and
                         W is the width of rectangle
so
find the a of rectangle ?
a is the symbol of area 

 
             putting the value of L and W
             10x20
                =30
  then give him unit for example you taking reading in meter 
          then  
           30metersquar 
 
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