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Plane figure with segments for sides polygon Angles with a common vertex, common side and no interior points in common Adjacent angles A position in space with no size point Two non-adjacent angles formed when two lines intersect Vertical angles Lines in the same plane that don’t intersect Parallel lines An angle with measure of less than 90 degrees Acute An Angle with measure equal to 90 degrees Right angle An Angle with measure greater than 90 degrees Obtuse Angle Point that divides a segment into two equal parts midpoint A flat surface with no thickness that extends indefinitely in all directions Plane Union of two rays with common endpoint that are non-collinear Angle Two lines that intersect to form right angles Perpendicular lines The common endpoint of two rays or segments Vertex Part of a line that is bounded by one endpoint Ray Two angles with a sum of 180 degrees Supplementary Angles Non-coplanar lines that do not intersect Skew lines A part of a line that is bounded by two endpoints Segment To cut in two equal parts bisect Two angles with the sum of 90 degrees Complementary angles Two figures with equal measure Congruent A series of points that extend in opposite directions without end line Point that divides a segment into two equal parts midpoint Polygon with opposite sides that are parallel parallelogram Polygon with 5 sides pentagon Six sided polygon Hexagon Quadrilateral with one pair of parallel sides trapezoid Four sided polygon Quadrilateral A segment that connects nonconsecutive vertices of a polygon Diagonal A convex polygon with all sides and angles congruent Regular Polygon A quadrilateral with four equal sides Rhombus A parallelogram with 4 congruent angles. Rectangle The _________ of a trapezoid is parallel to the bases and its measure is half the sum of the bases. Median The non-parallel sides of a trapezoid. legs A triangle with at least two equal sides Isosceles triangle Triangle with all acute angles Acute triangle Triangle with one obtuse angle Obtuse triangle Triangle with one right angle Right triangle A segment that connects a vertex to the midpoint of the opposite side of a triangle median Any line segment from a vertex perpendicular to the base, also the height of a figure altitude A triangle with all sides equal Equilateral triangle Figures with corresponding angles congruent and corresponding sides in equal ratios Similar A triangle with no equal sides Scalene triangle A ________ polygon has an exterior angle sum of 360 degrees. Convex The _________ angle sum of a convex polygon with “n” sides is given by the formula: S 180(n 2) Interior