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94,2 = 3,14 . D
94,2/3,14 = D
30 = D
15 = r
2 x /pi x r x t = luas selimut
2.3,14.15.13 = 1.224,6
luas permukaan = luas selimut + 2 kali luas alas
1.224,6 + 2.3,14.15.15 = 2.637,6