answer the following question
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x+y+w+z= 360
x+y+x+y= 360 (w+z=x+y)
2x+2y=360
2(x+y)=360
x+y=360/2
x+y=180
Angles on a straight line are 180
Therefore AOB is a straight line
x+y+x+y= 360 (w+z=x+y)
2x+2y=360
2(x+y)=360
x+y=360/2
x+y=180
Angles on a straight line are 180
Therefore AOB is a straight line
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