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2πr (r+t) : 4πr²
2πr(r+t) : 4πr²
2πr(r+t) : 2/3 X 6πr²
2πr(r+t) : 2/3 X 2πr(r+2r)
2πr(r+t) : 2/3 X 2πr(r+t)
1 : 2/3
Singkatnya,
L.tabung : L.bola
L.tabung : 2/3 X L.tabung
1 : 2/3
Maaf, kalau salah..