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384 = (s × s) + 4(1/2 × a × t)
384 = (12 × 12) + 4(1/2 × 12 × t)
384 = 144 + 4(6t)
384 = 144 + 24t
24t = 384 - 144
24t = 240
t = 10
c = 10 cm
b = 12 cm : 2
= 6 cm
a² = c² - b²
a² = 10² - 6²
a² = 100 - 36
a² = 64
√a² = √64
a = 8
t limas = 8 cm
V = 1/3 × La × t
= 1/3 × (s × s) × t
= 1/3 × (12 × 12) × 8
= 1/3 × 144 × 8
= 1/3 × 1152
= 384 cm³