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r=( 2P ) / ( a + b + c )
a,b,c - boki trójkąta
P - pole trójkąta
P= a* h / 2
8^2 + h^2= 17^2
h=15
P=16*15/2=120
r=240/(17+17+16)=240/50=4,8
Promień wynosi 4,8cm. :)