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In a triangle ABC, AB=6 `sqrt 3` cm, AC = 12 cm and BC =6cm . Then measure of `angle B` is equal to :
एक त्रिभुज ABC में, AB=6 `sqrt 3` cm, AC = 12 cm और BC = 6cm| `angle B` का माप ज्ञात करे

A

`45^@`

B

`60^@`

C

`70^@`

D

`90^@`

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