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Gopesh Gupta · Answer 1 · 2019-08-26T19:11:15+0000

B is the right answer because you can set up a ratio like this:

tan(A) = ((16.3)/(16.3))

If you solve for A, then you get:

A = tan^-1((16.3)/(16.3))

Hopefully this makes sense. Also, in the textbox, ∠A = 45° and your answer's B.