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b. Luas ADEF = 1/2 × 3/2 × BE/2 × √3
= 3/4 × 16/2 √3
= 6√3 cm²
c. V prisma = 3/2 (BE/2)² √3 t
= 3/2 × 8² √3 × 12 cm³
= 1152√3 cm²