Answer:
x+y+w+z=360
x+y+x+y=360
2(x+y)=360
(x+y)=360÷2
=180
x+y=180
therefore AOB is a line
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Answer:
x+y+w+z=360
x+y+x+y=360
2(x+y)=360
(x+y)=360÷2
=180
x+y=180
therefore AOB is a line