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192,5 cm² = π . r² . 5 cm
192,5 cm² : 5 cm = π . r²
38,5 cm = 22/7 . r²
38.5 cm : 22/7 = r²
38,5 cm . 7/22 = r²
12,25 cm = r²
r = √12.25 = 2√3,25