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Two angles that share a vertex and share a common side that separates them.
When two lines intersect to form four angles...the angles on opposite sides are vertical angles
Any two angles that add up to 90 degrees
When two angles add up to 180 degrees
A ray that divides an angle into two angles of equal degree measure
An angle whose measure is 90 degrees
an angle whose degree of measuer is greater than 0 degrees and less than 90 degrees
an angle whose measure is greater than 90 degrees but less than 180 degrees
an angle whose measure is 180 degrees
is formed by a pair of rays, one has remained stationary and the other has rotated through an angle of greater than 180 degrees but still less than 360 degrees
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