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La = 1/4 x s²√3 = 1/4 x 6 x 6 √3 = 9 √3
jadi = 1/3 x 9√3 x 10√3 = 3√3 x 10√3 = 30 x 3 = 90 cm³
(note: √3 x √3 itu √9 = 3)