S=πR²=25⇒R²=S/π⇒R=√S/π=√25/π=5/√π
C=2πR=2π*5/√π=10√π
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S=πR²=25⇒R²=S/π⇒R=√S/π=√25/π=5/√π
C=2πR=2π*5/√π=10√π