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Jawab
Lp = 3 . pi . r^2
= 3 . 3,14 . 100
= 942cm^2
atau
Lp = 2 . pi . r^2 + pi . r^2
= 2 . 3,14 . 100 + 3,14 . 100
= 628 + 314
= 942cm^2