L.permukaan bola= 4 π r^2
803,84 = 4 . 3,14 . r^2
803,84 = 12,56 . r^2
r^2 = 803,84 / 12,56
r = √64 = 8 cm
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L.permukaan bola= 4 π r^2
803,84 = 4 . 3,14 . r^2
803,84 = 12,56 . r^2
r^2 = 803,84 / 12,56
r = √64 = 8 cm