ΔABC is right angled at B. BD is an altitude. AD = 3 c

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

[2017 SSC CGL 21 Aug Shift-2]

A 6

B 5

C 4.5

D 5.5