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L = 1/2 . a . t
160 = 1/2 . 5x . 4x
160.2 = 20x
320 = 20x
x = 320:20 =16
jadi, tinggi = 4x = 4.16 = 64 cm
L = 160cm²
160cm² = 1/2 × a × t
1/2 × 160cm² = a × t
80cm² = a × t
t = 4/9 × 80 = 5,5