Answer:
EF=18 units
mE=67*
mF=46*
Explanation:
Using base angle theorem, if two legs are congruent, the angles formed by the legs and base are equal.
This means mD=mF=67*
Using sum of angles of a triangle (180*) we can subtract the angles D and F from 180: 180-(67+67) so we get mE=46*
Since we know ED=EF (The short lines on both legs mean they are congruent) we know EF=18 units