1.

With the usual notation, in \({\rm{\Delta }}ABC\), if ∠A + ∠B = 120°, \(a = \sqrt 3 + 1{\rm{\;and}}\;b = \sqrt 3 - 1\), then the ratio ∠A : ∠B, is:

A. 7 : 1
B. 5 : 3
C. 9 : 7
D. 3 : 1
Answer» B. 5 : 3


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