triangleABC is right angled at B. BD is ...

`triangleABC` is right angled at B. BD is an altitude AD+4 cm and DC = 9 cm. what is the value of BD?
(A) 5 cm (B) `4.5 cm (C) 5.5 cm (D) 6 cm

A

D

B

A

C

B

D

C

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