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niech d=a+b+c
figura ABCDEF
obw=2a+2b+2c=2d
9
P=2*PABC, bo:
APC=AP3C
APB=AP1B
BPC=BP2C
zas
AP3C+AP1B+BP2C=PABC
AP1BP2CP3=PABC+AP3C+AP1B+BP2C=2PABC