SOLUTION: I need to find the measure of the third angle and they give me this: x°, (123 – x)° how can i do it?

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Question 642660: I need to find the measure of the third angle and they give me this:
x°, (123 – x)°
how can i do it?
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
Let y = third missing angle

Since the three angles (in any triangle) must add to 180, we know that

x+(123-x) + y = 180

123 + y = 180

y = 180 - 123

y = 57


So the third angle is 57 degrees