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201 1/7 = 22/7 x r²
1408/7 = 22/7 x r²
r² = 1408/7 : 22/7
r² = 1408/7 x 7/22
r² = 9856/154
r² = 64
r = √64
r = 8 cm
4) K = 2 x π x r
110 = 2 x 22/7 x r
110 = 44/7 x r
r = 110 : 44/7
r = 110 x 7/44
r = 17,5 cm