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1.680 = 1/2 × A × T × T
1.680 = 1/2 × 10 × 12 × T
1.680 = 1 × 10 × 6 × T
1.680 = 60 × T
T = 1.680 ÷ 60
T = 28 cm
jdi panjang AD atau tinggi prisma segitiga adalah 28 cm