In △ABC\triangle ABC△ABC, ∠A=30∘,∠B=105∘,a=10\angle A = 30^\circ, \angle B = 105^\circ, a = 10∠A=30∘,∠B=105∘,a=10. Find side bbb.
10210\sqrt{2}102
525\sqrt{2}52
101010
202020