In , is an altitude from to side . If , , and AD= abc b^2-c^2 , then…

MATHEMATICS · Single correct · A Level · Mathematics · Trigonometry · Trigonometry

Problem

In △ABC\triangle ABC, ADAD is an altitude from AA to side BCBC. If b>cb>c, ∠C=23∘\angle C=23^\circ, and AD=abcb2−c2,AD=\frac{abc}{b^2-c^2}, then ∠B\angle B is (1) 110∘110^\circ (2) 113∘113^\circ (3) 120∘120^\circ (4) 130∘130^\circ

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