perimemter of triangle

Given that triangle ABC's perimeter is one. D,E,F is in the middle of AB,AC,CA. Find the perimeter of triange EDF
D,E,F is in the middle of AB,AC,CA (Given)
DE = 1/2 BC MID-POINT THEOREM
EF = 1/2 AB MID-POINT THEOREM
DF = 1/2 AC MID-POINT THEOREM
DE + EF + DF = 1/2 (BC+AB+AC) = 1/2 x 1= 1/2
therefore the perimeter of triange EDF = 1/2