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f=?
24,6cm:3=8,2 cm
f=8,2 cm
P=exf:2
P= 24,6 cm x 8,2 zm : 2
P=100,86 cm (kwad.)
d2=d1/3
d2=8,2
P=0,5*24,6*8,2=100,86
f= 24,6 : 3 = 8,2
P = e*f :2
P = 201,72 : 2 = 100, 86
nie wiem czy dobrze ;)