complementary - two angles with a measures that have a sum of 90°, acute - Angle less than 90°, obtuse - obtuse, reflex - Angle greater than 180° but less than 3600, protractor - Use to measures angle, degrees - The unit of measurement for angles, straight - Angles on a ------- line add up to 1800, intersection - Name for where two lines cross, opposite( vertical) - When two lines intersect, these angles are equal, supplementry - two angles with a measures that have a sum of 180°,

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