Well, they're called vertically adjacent angles. They have the property that they are supplementary, because the non-adjacent sides form a straight line.
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Vertical angles are angles opposite each other, formed by two intersecting lines. They have the same measure, and so are congruent.
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what is the formula for a vertical angle
The sign for a vertical angle is......(I don't know actually >.
Yes.
Vertical angles can be acute, right (if the intersecting lines forming them are perpendicular) or obtuse.
a y angle is the vertical line