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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