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c=25cm
3 ⁴/₇ *b=c
²⁵/⁷ *b=25 /*(⁷/₂₅)
b=7cm
a-b=17
a-7=17
a=17+7
a=24cm
P=½*a*b
P=½*24*7
P=12*7
P=84cm²
Obw=a+b+c
Obw=24+7+25
Obw=56cm