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V = 2akar5 * 2akar5 * 2akar5
V = 4 . 5 * 2akar5
V = 20 * 2akar5
V = 40akar5 cm^3
= 2√5 x 2√5 x 2√5
= 8 x 5√5
= 40√5 cm³