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t = V x 2 : (p x l)
t = 840 x 2 : (15 x 8)
t = 1.680 : 120
t = 14 cm
# Semoga Membantu
840 = (1/2 × 15 × 8) × tinggi
840 = 60 × tinggi
tinggi = 840/60
= 14 cm