ΔABC is right angled at B. BD is an altitude. AD = 9 c

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

[2017 SSC CGL 17 AUG Shift 1]

A 6

B 18

C 21

D 12