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Baiatul122001id

[tex]A=\pi r^2\\a) A=16\pi cm^2\\16\pi=\pi r^2=>r=\sqrt{16}=4 cm\\b)A=36\pi cm^2\\36\pi=\pi r^2=>\sqrt{36}=6 cm\\c) A=225\pi cm\\225\pi=\pi r^2=>r=\sqrt{225}=15 cm\\d)A=2\pi cm^2\\2\pi=\pi r^2=>r=\sqrt{2} cm[/tex]

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