Answer:
We have the following information :
Measure of first angle : [tex]90[/tex]°
Measure of second angle : [tex]50[/tex]°
Measure of third angle :
We know that the angles of a triangle is 180°
[tex]90 + 50 + x =180[/tex]
[tex]140 + x = 180[/tex]
moving 140 to the other side, [tex]x = 180-140[/tex]
[tex]x = 40[/tex]°
Measure of third angle is 40°
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Dan