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Unit 1 Angle Relationships Vocabulary Foldable Directions: Please cut and glue your Unit 1 vocabulary terms on the outside of your foldable and the definition on the corresponding inside flap. We will add examples tomorrow in class. Parallel Lines Lines in the same plane that NEVER cross. Perpendicular Lines Lines that intersect to form right angles Intersecting Lines Two lines in a plane that cross each other Transversal A line that intersects two or more lines Complementary Angles Two angles whose measures add up to 90 degrees Supplementary Angles Two angles whose measures add up to 180 degrees. (When parallel lines are cut by a transversal, the obtuse angles and the acute angles will form supplementary angles) Congruent Having the EXACT same size, shape, and measure Alternate Interior Angles Created when a transversal crosses two parallel lines. Each pair of these angles are inside the parallel lines and on opposite sides of the transversal. Alternate Exterior Angles Created when a transversal crosses two parallel lines. Each pair of these angles are outside the parallel lines and on opposite sides of the transversal. Vertical Angles Angles that share a vertex, but NO common sides (they are across from each other) Adjacent Angles Two angles that share a common vertex AND a common side (they are beside each other) Corresponding Angles Angles that are on the same side of the transversal and have the same measurement angle Same Side Interior Angles Angles that are on the SAME SIDE of the transversal and are INSIDE the parallel lines Same Side Exterior Angles Angles that are on the SAME SIDE of the transversal, and are OUTSIDE the parallel lines