Ta có: \(AB=DC=x+3x=4x\left(m\right)\)
Do chu vi ABCD lớn hơn chu vi ADEF là 72m
\(\Rightarrow\left(2AD+2AB\right)-\left(2AD+2AF\right)=72\)
\(\Rightarrow\left(4x+8x\right)-\left(4x+2x\right)=72\)
\(\Rightarrow6x=72\)
\(\Rightarrow x=12\left(m\right)\)
\(\Rightarrow CE=3x=36\left(m\right)\)