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coba hitung lagi karena masih blm yakin
BC² = 81 + 144
BC² = 225
BC = √225
BC = 15 cm
b) BD= ...
AB² = BD × BC
81 = BD × 15
81/15 = BD
5,4 cm = BD
c) AD=...
AD² = BD × CD
AD² = 5,4 × 9,6
AD² = 51, 84
AD = √51,84 cm
Semoga Membantu :D