Download An angle bisector divides the angle into two congruent angles, each

An angle bisector divides the angle into two congruent
angles, each of which has measure half that of the given
angle.
An angle of measure less than 180 degrees has exactly
one bisector.
If the exterior sides of two adjacent angles are opposite
rays, then the angles are supplementary.
Two angles complementary to the same angle or angles
of equal measure have equal measure.
Two angles complementary to the same angle or
congruent angles are congruent.
Two angles supplementary to the same angle or angles
of equal measure have equal measure.
Two angles supplementary to the same angle or
congruent angles are congruent.
If 2 lines intersect to form right angles, then they are
perpendicular.
If 2 lines are perpendicular, then they form right angles.
If the exterior sides of two adjacent acute angles are
perpendicular, then the angles are complementary.
All right angles have equal measure.
Two adjacent angles formed by perpendicular lines
have equal measure.
If two lines form adjacent angles with equal measures,
then the lines are perpendicular.
Vertical angles have equal measure.