90 degrees.
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It can be almost any measure but the important thing to remember is that vertical angles are congruent, so any angle that is vertical to another has the same measurement as the angle it is vertical to.
It is a right angle, or an angle whose measure is 90 degrees or pi/2 radians.
they should be all 180degrees if i understand what you are saying
Vertical angles have the same angle measure. Vertical angles are formed by two intersecting lines that look like an "x". Angles that are across from each other on this "x" are called vertical angles.
A reflex angle is one whose measure is greater than 180 degrees but less than 360 degrees. Vertical angles can be reflexive.