2√2/(sin(30)) = 4/(sin(a))
2√2 . sin(a) = 4.1/2
sin(a) = 2/(2√2) = 1/√2
a = 45°
a+b+c = 180
45+30+c = 180
c = 105°
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2√2/(sin(30)) = 4/(sin(a))
2√2 . sin(a) = 4.1/2
sin(a) = 2/(2√2) = 1/√2
a = 45°
a+b+c = 180
45+30+c = 180
c = 105°