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c² = (12 cm)² + (9 cm)²
c² = 144 cm² + 81 cm²
c² = 225 cm²
c = √225 cm²
c = 15 cm
c² = a² + b²
c² = (15 cm)² + (8 cm)²
c² = 225 cm² + 64 cm²
c² = 289 cm²
c = √289 cm²
c = 17 cm
Jadi jawabannya adalah 17 cm
Kemudian kita cari panjang AD