Question 1068333
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First of all, angle B = 180° - 72.4° - 38.7° = 68.9°.


Now, apply the Law of sines   (see the lesson <A HREF=https://www.algebra.com/algebra/homework/Triangles/Law-of-sines.lesson>Law of sines</A> in this site)


{{{b/sin(B)}}} = {{{a/sin(A)}}},


which gives you 


{{{3.8/sin(68.9^o)}}} = {{{a/sin(72.4^o)}}}.


Find "a" from here:  a = {{{(3.8*sin(72.4^o))/sin(68.9^O)}}}.


Use your calculator.


Similar procedure works for "c".
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