Using Law of Sines in △ABC\triangle ABC△ABC, if a=10,∠A=30∘,∠B=45∘a=10, \angle A=30^\circ, \angle B=45^\circa=10,∠A=30∘,∠B=45∘, find bbb.
525\sqrt{2}52
10210\sqrt{2}102
555
20220\sqrt{2}202