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R=12,5 cm
r=p-c
a+b-25=6
a+b=31
a²+(31-a)²=25²
a²+961-62a+a²-625=0
2a²-62a+336=0
a²-31a+168=0
Δ=31²-4*168=289
a=1/2(31+17)=24 lub a=1/2*(31-17)=7
P=1/2*24*7=12*7=84
r=3
c=25 - przeciwprostokątna