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L. Alas = a . t . 1/2
L. Alas = 6 . √27 . 1/2
L. Alas = 3 . 3√3
L. Alas = 9√3
V. Prisma = L.alas x t
V. Prisma = 9√3 x 15
V. Prisma = 135√3
volume=1/4×s²×√3×15
volume=1/4×36×√3×15
volume=135√3 cm³(C)