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D1 = 2x
D2 = 3x
Luas = ½ * D1 * D2
192 = ½ * 2x * 3x
192 = ½ * 6x²
6x² = 2 * 192
6x² = 384
x² = 384 : 6
x² = 64
x = 8
D1 = 2x = 2 * 8 = 16
D2 = 3x = 3 * 8 = 24