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d1 * d2 / 2 = luas
3x * 4x / 2 = 150
6x^2 = 150
x^2 = 150/6
= 25
x = √25
= 5
d1 = 3x
= 3(5)
= 15
d2 = 4x
= 4(5)
= 20