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dengan rumus
Lp bola = 4πr² = 150 ---> πr² = 150/4 = 37,5
Lp Tabung = 2πr² + 2πrt (dimana t = 2r)
maka lp tabung = 2πr² + 4πr² = 6πr² = 6x37,5 = 225 cm²