In this question first identify the midpoints of BC and EF using perpendicular bisector.
This should be followed by joining the two midpoints with a straight edge to draw the mirror line.
The points above the mirror line F,A and B will be reflected below the mirror line.The points below the mirror line C,D and E will be reflected above the mirror line.
Acute. Step-by-step explanation: Using the Triangle Inequality Theorem you know that the sum of the lengths of two sides of a triangle are greater than the length of the third side.