R=1,. S=πR^2=π=3,14
R=10. S=πR^2=100π=3,14×100=314sm^2
R=15,. S=πR^2=225π=3,14×225=706,5
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R=1,. S=πR^2=π=3,14
R=10. S=πR^2=100π=3,14×100=314sm^2
R=15,. S=πR^2=225π=3,14×225=706,5