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d=R-r
2πR=25
R=25/2π
2πr=20,25
r=20,25/2π
d=25/2π-20,25/2π=4,75/2π=2,375/π≈0,76cm
p.S liczę na Naj ;)
2πR=25
R=25/2π
2πr=20,25
r=20,25/2π
d=25/2π-20,25/2π=4,75/2π=2,375/π≈0,76cm