MN=sqrt((-5-(-10))^(2)+(-1-(-11))^(2))=sqrt(25+100)=sqrt(125) ≈11,180,
NK=sqrt((4-(-5))^(2)+(5-(-1))^(2))=sqrt(81+36)=sqrt(117) ≈10,817 ,
KL=sqrt((11-4)^(2)+(3-5)^(2))=sqrt(49+4)=sqrt(53) ≈ 7,280,
LM=sqrt((-10-11)^(2)+(-11-3)^(2))=sqrt(441+196)=sqrt(637) ≈ 25,239.
P_(MNKL)=MN+NK+KL+LM=11,180+10,817+7,280+25,239=
=54,516 ≈ 54,52.