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Quadrilateral A closed figure having four sides and four angles. Supplementary Angles Two angles that are this if the sum of their measures is 180 degrees. Similar Figures Figures that have the same shape but not necessarily the same size. Tessellation A repetitive pattern of polygons that fit together with no holes or gaps. Vertex A common endpoint of the rays forming an angle. Complementary Angles Two angles are this if the sum of their measure is 90 degrees. Line of Reflection The line over which a figure is reflected. Parallelogram A quadrilateral with opposite sides parallel and opposite sides congruent. Polygon A simple closed figure in a plane formed by three or more line segments. Obtuse Angle Any angle that measure greater than 90 degrees but less then 180 degrees. Transformation A movement of a geometric figure. Congruent Angles Angles that have the same measure. Acute Angle An angle with a measure greater than zero and less than ninety degrees. Congruent Figures Figures with equal corresponding sides of equal length and corresponding angles of equal measure. Line of Symmetry A line that divides a figure into two halves that are reflections of each other. Line Symmetry Figures that match exactly when folded in half. Reflection When a figure if flipped over a line of symmetry. Rhombus A parallelogram having four congruent sides. Straight Angle An angle that measures exactly 180 degrees. Translation When a geometric figure is slid horizontally or vertically, or both. Trapezoid A quadrilateral with one pair of parallel sides.