1). C=2пиr=2пи*11/3=22/3пи=7 1/3пи
2). S=пиr^2=пи*4/пи^2=4/пи
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1). C=2пиr=2пи*11/3=22/3пи=7 1/3пи
2). S=пиr^2=пи*4/пи^2=4/пи