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Vertical angles<span> are the angles opposite each other when two lines cross, so
</span>∠AOB and ∠DOC are vertical.
2y = 10
y = 10/2
y = 5 <==horizontal
this is a horizontal line. Anytime you have y = an integer, it is horizontal...and if u have x = an integer, it is a vertical line.
The angles are congruent and corresponding. You can find the missing angles by subtracting the existing ones from 180.
