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R=c/2
c=2R
c=2*10=20cm
a+b+c=48
a+b=48-20
a+b=28cm
r=(a+b-c)/2
r=(28-20)/2
r=8/2
r=4cm promien kola wpisanego
c=2*10=20 cm
p=1/2*48=24 cm
r=p-c
r=24cm-20cm=4 cm