Acute , Less 90 degrees , , Acute , right angle, exactly 90 degrees , , Right angle, Obtuse , more then 90 degree and less then 180 degree , , Obtuse , Straight angle , exactly 180 degree , , Straight Angle , congruent, angles that have the exact same measure, , congruent, linear pair , a pair of adjacent angles whose non-common sides form a straight line, meaning their measures add up to 180°, , linear pair.

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