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a). bc² = ba²+ac²
bc = √9²+√12²
= √81+√144
= √225
= 15 cm
b). ab² = bd×bc
9² = bd×15
81 = bd×15
bd = 81÷15
= 5,4 cm
yg c). gakeliatan
maaf kalo salah, maklum sama2 belajar:D