[tex]Obw=22\pi\\2\pi r=22\pi\ |:2\pi\\r=11\\\\P=\pi r^2\\P=\pi*11^2=\pi*121=121\pi[/tex]
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[tex]Obw=22\pi\\2\pi r=22\pi\ |:2\pi\\r=11\\\\P=\pi r^2\\P=\pi*11^2=\pi*121=121\pi[/tex]