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Angles with a common vertex, common side and no interior points in common Adjacent angles A triangle with at least two equal sides isosceles Plane figure with segments for sides polygon A position in space with no size point Three dimensional figure with polygonal bases in parallel planes with the other surfaces as parallelograms prism The number of cubic units it takes to fill a region volume A segment that connects a vertex to the midpoint of the opposite side of a triangle median Two non-adjacent angles formed when two lines intersect Vertical angles Any line segment from a vertex perpendicular to the base, also the height of a figure altitude Lines in the same plane that don’t intersect Parallel lines Point that divides a segment into two equal parts midpoint Polygon with opposite sides that are parallel parallelogram Polygon with 5 sides pentagon A flat surface with no thickness that extends indefinitely in all directions Plane Six sided polygon Hexagon A triangle with all sides equal Equilateral triangle Union of two rays with common endpoint that are non-collinear Angle Set of points a given distance from a given point called the center circle Two lines that intersect to form right angles Perpendicular lines The common endpoint of two rays or segments Vertex Quadrilateral with one pair of parallel sides trapazoid The sum of the area of all the faces of a figure Surface Area Three dimensional figure with polygonal base and a vertex not in the plane of the base pyramid Four sided polygon Quadrilateral Part of a line that is bounded by one endpoint Ray Two angles with a sum of 180 degrees Supplementary Angles Set of points in space a given distance from a given point called the center Sphere The altitude of the lateral face of a pyramid Slant Height Non-coplanar lines that do not intersect Skew lines Figures with corresponding angles congruent and corresponding sides in equal ratios Similar Three dimensional figure with a circular base and a vertex not in the same plane as the base Cone Three dimensional figure with two circles as bases that are in parallel planes Cylinder A segment that connects nonconsecutive vertices of a polygon Diagonal A polygon with all sides and angles congruent Regular Polygon A quadrilateral with four equal sides Rhombus A triangle with no equal sides Scalene triangle 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