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84 = 12 x tinggi/2
84 x 2 = 12 x tinggi
168 = 12 x tinggi
tinggi = 168 : 12
tinggi = 14 cm
84 = 1/2 x 12 x tinggi
84 = 6t
t = 84/6
t = 14
Jadi, tingginya adalah 14 cm.
Itu jawabannya.