Find y in the following diagrams.
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acute angle obtuse angle
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1) 80+57+5x-6=180
x=49/5
2)45+45+4y+18=180
y=18
3) 31+11x+11+39=180
x=9
4)60+40+y=180
y=80
x+y=180(because it is a straight line)
x+80=180
x=100
x=49/5
2)45+45+4y+18=180
y=18
3) 31+11x+11+39=180
x=9
4)60+40+y=180
y=80
x+y=180(because it is a straight line)
x+80=180
x=100
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