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What is the measure of the missing angle?

What is the measure of the missing angle?-example-1
User Gcantoni
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115°
A triangle is 180° so add the two degrees given and subtract that from 180; 180-(75+40)
180-155= 65. then a line is 180 degrees so you subtract 65 from 180 and get 115
User Breno Teixeira
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