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628 = 3.14 x r² x 8
r² = 628/ 25.12
r² = 25
r ≡√25 = 5 cm
diameter = 2 x r = 2 x 5 = 10 cm
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628 cm = 3,14. r2. 8cm
628 cm =25,12. r2
r2 = 628/25,12
r2=25
r= akar pangkat 25 = 5 cm