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c^2=a^2+b^2 => c^2=12^2+16^2 => c^2=400 => c=20
r=2P/(a+b+c) => r=2*96/(12+16+20) => r=192/48 => r=4
P=a*b/2=1*2/2=1
c^2=a^2+b^2 => c^2=1^2+2^2 => c^2=5 => c=pierwiastek z 5
r=2P/(a+b+c) => r=2*1/(1+2+pierwiastek z 5) =>
r=2/(3 + pierw z 5)*(3- pierw z 5)/(3- pierw z 5)
r=(6-2 pier z 5)/(9+5)
r=(3 - pierwiastek z 5)/2
Liczę na naj :)