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384 = 12 × 12 + 4(1/2 × 12 × t)
384 = 144 + 4(6t)
384 - 144 = 24t
240 = 24t
t = 10 cm
t.limas² = 10² - (12/2)²
= 10² - 6²
= 100 - 36
= 64
t.limas = √64
= 8 cm