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Luas alas = V / t = 8√3 / 2 = 4√3 cm².
Luas segitiga sama sisi = 1/2 a . t
4√3 = 1/2 . a . 1/2a√3
1/4 a² = 4
a² = 4 X 4
a = √16 = 4 cm
Maka panjang rusuk alas = 4 cm