Segment AB = 4cm, extend segment AB to C, BC = 1cm, and then extend AB to D in reverse direction, so that ad = 3cm, e is the midpoint of AD, f is the midpoint of CD, find the length of EF

Line AB = 4cm, extend line AB to C, BC = 1cm, ad = 3cm, e is the midpoint of AD,
AE=1.5
F is the midpoint of CD, CF = (3 + 4 + 1) / 2 = 4
AF=1
EF=1.5+1=2.5
EF=2.5cm

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