adjacent angle - angles that share a common side, angle bisector - a ray that divides an angle into two congruent angles, collinear - points that lie on the same line, complementary angles - 2 angles whose sum is 90 degrees, congruent - equal, coplanar - points that lie on the same plane, intersection - the set of points the figures have in common, line - a straight path that extends forever in both directions, line segment - part of a line that has 2 endpoints, plane - a flat surface that extends in all directions, point - an exact location, ray - extends forever in one direction, segment bisector - any segment, line, or plane that intersects a segment at the midpoint, supplementary angles - has 2 angles whose sum is 180 degrees, vertical angles - two nonadjacent angles formed by intersecting lines, congruent,

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