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Matematika
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Pertanyaan
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1 Jawaban
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1. Jawaban rifkyulliyah
L alas = Πr² = 3,14×7² = 3,14×49 = 154
L selimut = 2Πrt = 2×3,14×7×20 = 879
L permukaan = 2×(L alas + L selimut) = 2×(154+879) = 2066 ..