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192,5 = 3,14*r*r*5
192,5 = 15,7*r*r
r*r = 192,5 : 15,7
r kuadrat = 12,26
192,5 = 3,14 r² 0,5
192,5 = 1, 57 r²
r² = 192,5 / 1,57\
r² = 122,61
r = √122,61