$\triangle ABC $is right angled at B. If$ m\angle A$ = $30^{0}$, what is the length of AB (in cm), if AC = 10 cm?

$\triangle ABC $is right angled at B. If$ m\angle A$ = $30^{0}$, what is the length of AB (in cm), if AC = 10 cm?
1). 5
2). $5\sqrt{3}$
3). $10\sqrt{3}$
4). 10

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