$\triangle ABC$ is right angled at B. BD is an altitude. AD = 9 cm and DC = 16 cm. What is the value of BD (in cm)?

$\triangle ABC$ is right angled at B. BD is an altitude. AD = 9 cm and DC = 16 cm. What is the value of BD (in cm)?
1). 6
2). 18
3). 21
4). 12

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