
If AB is the ground, and dot E,F,C's height above AB is h1, h2, h3, respectively, then h1+h3=2*h2.
So, AEG+HCB=2*GFH
Similarly, if DC is ground, we can get: ADE+HFC=2*GEF
So, ADEG+HFCB=2*GEFH

If AB is the ground, and dot E,F,C's height above AB is h1, h2, h3, respectively, then h1+h3=2*h2.
So, AEG+HCB=2*GFH
Similarly, if DC is ground, we can get: ADE+HFC=2*GEF
So, ADEG+HFCB=2*GEFH
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