Respuesta :

We know, sum of all angles is equal to 180
Let, the missing angle = x

x + 34 + 90 = 180
x = 180 - 124
x = 56

In short, Your Answer would be 56

Hope this helps!
90+34=124 and a triangle equals 180 so 180-124=56 so the side should equal 56 degrees
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