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Tinggi limas:
= 1/3 × 18
= 6 cm
Tinggi prisma:
= 2/3 × 18
= 12 cm
Volume limas + Volume prisma = 1.400 cm
(1/3 × La × t) + (p × l × t) = 1.400
(1/3 × x² × 6) + (x² × 12) = 1.400
2x² + 12x² = 1.400
14x² = 1.400
x² = 100
x = 10
Panjang rusuk alas prisma = 10 cm (A)