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Pole ABC (wzor Herona)
P=√[68(68-34)(68-52)(68-50)=√665856=816
1/2*34*h=816 /:17
h=48m
Skala podobienstwa ΔDCE do ΔABC k=28/48=7/12
|DE|=7/12*34=119/6 m
|DC|=7/12*52=91/3m
|EC|=7/12*50=175/6m
ObDCE=119/6+91/3+175/6=238/3 m = 79 1/3 m
|AE|=50-176/6=62/3m
|BD|=52-91/3=65/3m
ObABED=34+65/3+62/3+119/6=96 1/6 m