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L alas = πr²
L selimut = K alas * tinggi = 2πrt
L tabung = 2 L alas + L selimut = 2πr(r + t)
V tabung = L alas * t = πr²t
L tabung tanpa tutup = L alas+L selimut = πr(r+2t)
semoga membantu ;)