perpdendicular, lines that intersect at 90 degrees or right angles, vertex, A corner point of a geometric figure., right angle, A right angle is an internal angle equal to 90°, acute angle, An Acute Angle is less than 90, obtuse angle, An obtuse angle is more than 90° but less than 180°, straight angle, It measures 180°, congruent angles, angles that have the exact same measure, adjacent angles, Two angles are adjacent when they share a common side and a common vertex (corner point), and don't overlap., angle addition postulate, if two adjacent angles form a larger angle, the sum of the measures of the two smaller angles is equal to the measure of the larger angle, angle bisector , A line that splits an angle into two equal angles., vertical angles, The angles opposite each other when two lines cross. They are always equal., complementary angles, Two angles are Complementary when they add up to 90 degrees, supplementary angles, When two angles add up to 180° we call them supplementary angles., linear pair, A linear pair consists of two adjacent angles that are supplementary, meaning they add up to degrees and only form to a straight line.

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