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phi x r² = 200,96
3,14 x r² = 200,96
r² = 200,96 : 3,14
r² = 64
r = √64
r = 8 cm
200,96 = 3,14 x r2
200,96/3,14 = r2
64 = r2
√64 = r
8 cm = r