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= √12² + 9²
= √144 + 8
= √225
= 15 cm
AB² = BD . BC
9² = BD . 15
81 = BD . 15
BD = 81/15
BD = 5.4 cm
AD = √BD . CD
= √5.4 x (15-5.4)
= √5.4 x 9.6
= √51.84
= 7.2 cm