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### 20 Cards in this Set

• Front
• Back
 formed by two rays with a common vertex angle angle measuring less than 90 degrees acute angle angle measuring exactly 90 degrees right angle angle measuring more than 90 but less than 180 degrees obtuse angle extends forever in both directions line part of a line with two endpoints line segment part of a line with 1 end point extending in 1 direction ray the point where 2 lines meet vertex names an exact location point a flat surface that extends forever in all directions plane exactly the same shape but different sizes similar exactly the same size and shape congruent congruent angles that are opposite of each other and formed when two lines intersect vertical angles 2 angles whose sum is 90 degrees complementary angles 2 angles whose sum is 180 degrees supplementary angles the line that intersects 2 parallel lines transversal 2 lines that never intersect parallel lines 2 lines that cross to form right angles perpendicular angles angles that lie in the same location on parallel lines cut by a transversal corresponding angles angles that lie INSIDE 2 parallel lines but are on opposite sides of the transversal alternate interior angles