$\triangle ABC $is right angled at B. BD is an altitude. AD = 4 cm and DC = 9 cm. What is the value of BD (in cm)?

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

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