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60 x 2 = 4X x 6
120 = 4X x 6
4X = 120 : 6
4X = 20
X = 5 cm
Jadi panjang alas segitiga adalah 5 cm.
Maaf kalo salah.
60 cm2 = 1/2 × (4x) × 6 cm
60 cm2 = 2x × 6 cm
60 cm2 = 12x cm
x = 60 cm2 : 12 cm
x = 5 cm