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Bab Trigonometri
PS = QR = 12 cm
Luas jajar genjang
= 2 . luas segitiga
= 2 . 1/2 . PQ . PS . sin P
= 15 . 12 . sin 60°
= 15 . 12 . 1/2 √3
= 90 √3 cm²