$\triangle ABC $is right angled at B. BD is an altitude. AD = 3 cm and DC = 9 cm. What is the value of AB (in cm)

$\triangle ABC $is right angled at B. BD is an altitude. AD = 3 cm and DC = 9 cm. What is the value of AB (in cm)
1). 6
2). 5
3). 4.5
4). 5.5

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