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In `triangle ABC`,the bisector of `angle A` intersect side BC at D. If AB=12cm, AC =15cm and BC=18cm , then the length of BD is:
`triangle ABC` में, `angle A` का द्विभाजक BC को D पर प्रतिच्छेदित करता है| यदि AB = 12cm, AC = 15cm और BC= 18cm है, तो BD की लंबाई है:

A

9 cm

B

9.6 cm

C

7.5 cm

D

8 cm

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