 ### Flashcard of a Parallelogram

A flashcard featuring an illustration of a Parallelogram ### Flashcard of a polygon with four equal sides

A flashcard featuring an illustration of a polygon with four equal sides ### Flashcard of a polygon with four equal sides

A flashcard featuring an illustration of a polygon with four equal sides ### Flashcard of a polygon with four unequal sides

A flashcard featuring an illustration of a polygon with four unequal sides ### Flashcard of a Rectangle

A flashcard featuring an illustration of a Rectangle ### Flashcard of a Rhombus

A flashcard featuring an illustration of a Rhombus ### Flashcard of a Trapezoid

A flashcard featuring an illustration of a Trapezoid ### Parallelogram

Parallelogram with angles labeled. ### Parallelogram

Illustration of a parallelogram, a quadrilateral which has opposite sides parallel. ### Parallelogram With Vertices Labeled

An illustration of a parallelogram with vertices labeled. ### Altitude and Diagonal of a Parallelogram

Illustration of a parallelogram with altitude and diagonal drawn. ### Parallelogram With Diagonals Bisecting Each Other

Illustration of a parallelogram with diagonals drawn to show they bisect each other. ### Equal Parallelograms

Illustration of a two equal parallelograms. Two parallelograms are equal, if two sides and the included… ### 4-sided Polygon

Polygon consisting of 4 sides ### Fractions of 4-sided Polygon

1/4 of a 4 sided polygon ### Fractions of 4-sided Polygon

2/4 of a 4 sided polygon ### Fractions of 4-sided Polygon

3/4 of a 4 sided polygon ### Fractions of 4-sided Polygon

4/4 of a 4 sided polygon ### Fractions of 4-sided Polygon

4/4 of a 4 sided polygon with one piece detached  ### Equiangular Polygons

Illustration of a two polygons. Polygons may be mutually equiangular without being mutually equilateral. ### Equilateral Polygons

Illustration of two polygons. Polygons may be mutually equilateral without being mutually equiangular… Illustration of a quadrilateral, a four-sided figure. ### Axis of Symmetry Drawn on a Quadrilateral

Illustration of an axis of symmetry drawn with respect to a quadrilateral. Illustration of a quadrilateral which has two adjacent sides equal and the other two sides equal. It… ### Rectangle

Rectangle with angles labeled. Parallelogram with right angles. ### Rectangle

Illustration of a rectangle, which is a parallelogram with all angles right angles. ### Rhomboid

Illustration of a rhomboid, which is a parallelogram which has its angles oblique angles. ### Rhombus

Illustration of a rhombus, which is a rhomboid with all sides equal. ### Square

Square with angles labeled. A rectangle with four equal sides. ### Square

Illustration of a square, a rectangle with all sides equal. ### Trapezium

Illustration of a trapezium, a quadrilateral which has no two sides parallel. ### Trapezoid

Trapezoid with angles and height labeled. ### Trapezoid

Illustration of a trapezoid, a quadrilateral which has two and only two sides parallel. ### Trapezoid With Median

Illustration of a trapezoid, with the median drawn. The median of a trapezoid is parallel to the bases,…