Your sense of triangles tells you the length will be somewhat smaller than 44. The only suitable choice is D. 9.35.
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You know, for example, that an isosceles right triangle with both legs equal has an angle B of 45°. Your angle here is about 1/4 of that, so the opposite side will be roughly 44/4 = 11. That's certainly a close enough estimate to find the correct choice among the answers offered.
