If a 1 could 1 could a 1 sit on a 2 when a 2 eats a 3 after the 3 sits on 1?
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You need the Law of Sines for this. In our case we have the measure of angle B and side b, we have the measure of angle A and are looking for side a, or x. Setting up the Law using our info, we have 
. We will solve for x by multiplying both sides by sin(42): 
, first choice above.