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r2 = 5.024 cm / 4x3,14
r2 = 5.024 / 12,56
r2 = 400
r = 20 cm2
5.024=4.3,14.R²
5.024=12,56R²
12,56R²=5.024
R²=5.024÷12,56
R²=400
R=20cm²