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rumus luas belah ketupat = d1.d2/2
4x.3x/2 = 150
12x²/2 = 150
6x² = 150
x² = 25
x = 5
maka panjang diagonal AC = 4x = 4.5 = 20 cm
panjang diagonal BD = 3x = 3.5 = 15 cm