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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