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150 = 15(3x + 2) x 1/2
150 = 7,5(3x + 2)
150 = 22,5x + 15
150-15 = 22,5x
135 = 22,5x
6 = x
maka diagonal kedua
d2 = 3x + 2
d2 = 3(6) + 2
d2 = 18+2
d2 = 20 cm