A closed figure having four sides and four angles.
Two angles that are this if the sum of their measures is 180 degrees.
Figures that have the same shape but not necessarily the same size.
A repetitive pattern of polygons that fit together with no holes or gaps.
A common endpoint of the rays forming an angle.
Two angles are this if the sum of their measure is 90 degrees.
Line of Reflection
The line over which a figure is reflected.
A quadrilateral with opposite sides parallel and opposite sides congruent.
A simple closed figure in a plane formed by three or more line segments.
Any angle that measure greater than 90 degrees but less then 180 degrees.
A movement of a geometric figure.
Angles that have the same measure.
An angle with a measure greater than zero and less than ninety degrees.
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.
Figures that match exactly when folded in half.
When a figure if flipped over a line of symmetry.
A parallelogram having four congruent sides.
An angle that measures exactly 180 degrees.
When a geometric figure is slid horizontally or vertically, or both.
A quadrilateral with one pair of parallel sides.