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Acute Angle:
An angle that measures less than 90 degrees.
Right Angle:
An angle that measures exactly 90 degrees.
Obtuse Angle:
An angle that measures more than 90 degrees but less than 180 degrees.
Straight Angle
: An angle that measures exactly 180 degrees. It forms a straight line.
Congruent Angles:
Angles that have the same measure.
Angle Bisector:
A ray that divides an angle into two congruent angles.
Complementary Angles:
Two angles whose measures add up to 90 degrees.
Supplementary Angles:
Two angles whose measures add up to 180 degrees.
Adjacent Angles:
Two angles that share a common vertex and side but have no common interior points.
Linear Pair:
Two adjacent angles whose non-common sides are opposite rays. They form a straight line and are supplementary.
Vertical Angles:
A pair of non-adjacent angles formed by intersecting lines. They are congruent.