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Rumus = 6 . sisi . sisi
» 6 . 40 . 40
» 9.600 (B.)
31. Luas permukaan Tabung
Dik.
d = 30
t = 50
r = 15
Luas permukaan :
» 2 . π . r . (r + t)
» 2 . 3,14 . 15 . (15 + 50)
» 94,2 . 65
» 6.123 (D.)
32. Rumus volume Balok
Rumus =
V = p . l . t
V = 15 . 5 . 10
V = 750cm —» 75dm (B.)