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a+b+c=12
c=2r czyli c=5
a+b=7 to a=7-b
a^2+b^2=25
(7-b)^2+b^2=25
49-14b+b²+b²-25=0
2b²-14b+24=0
b²-7b+12=0
Δ=1
b=3 lub b=4
a=4 lub a=3
P=a*b/2
P=3*4/2
P=6 j²