Question 940059
length  = 58 m
effective length excluding corners of 8 m length  =  58-8-8  ( each side consist of 2  8 m corners )
     =42 m
 effective width  =  45-8-8
                  = 29 m
 perimeter  excluding 8 m corners  =  2( effective length + effective width)
             =2(42+29)
       =2(71)
= 142 m
Result : perimeter  = 142 m