The Quadrilaterals ClipArt gallery offers 93 illustrations of a variety of closed two-dimensional geometric figures with four sides. The most common quadrilaterals are squares, rectangles, parallelograms, and trapezoids. Images include examples of concentric and inscribed quadrilaterals.

"From Figure 4 he sees a parallelogram equal to a rectangle of the same base and altitude. Cut out and paste in rectangle form." -Foster, 1921

Area of Parallelogram

"From Figure 4 he sees a parallelogram equal to a rectangle of the same base and altitude. Cut out and…

"The student sees the trapezoid is equal in area to a rectangle whose base is the average base of the trapezoid, and whose altitude is the same as that of the trapezoid." -Foster, 1921

Area of Trapezoid

"The student sees the trapezoid is equal in area to a rectangle whose base is the average base of the…

"The student sees the trapezoid is equal in area to a rectangle whose base is the average base of the trapezoid, and whose altitude is the same as that of the trapezoid." -Foster, 1921

Area of Trapezoid

"The student sees the trapezoid is equal in area to a rectangle whose base is the average base of the…

Illustration of a circle inside of 2 concentric rectangles whose vertices are connected by line segments.

Circle Inside Concentric Rectangles

Illustration of a circle inside of 2 concentric rectangles whose vertices are connected by line segments.

Illustration of a parallelogram with diagonals AC and BD intersecting at point O.

Parallelogram With Diagonals

Illustration of a parallelogram with diagonals AC and BD intersecting at point O.

2 squares that are similar figures

Similar Figures

2 squares that are similar figures

2 rectangles that are similar figures

Similar Figures

2 rectangles that are similar figures

A square divided into equal squares, like a chessboard, in each of which is placed one of a series of consecutive numbers from 1 up to the square of the number of cells in a side, in such a manner that the sum of the numbers in each row or column and in each diagonal is constant.

Magic Square

A square divided into equal squares, like a chessboard, in each of which is placed one of a series of…

"In the diagram, let AB and AC represent two forces acting upon the point, A. Draw the two dotted lines to complete the parallelogram." — Avery, 1895

Parallelogram

"In the diagram, let AB and AC represent two forces acting upon the point, A. Draw the two dotted lines…

Parallelogram with angles labeled.

Parallelogram

Parallelogram with angles labeled.

Illustration of a parallelogram, a quadrilateral which has opposite sides parallel.

Parallelogram

Illustration of a parallelogram, a quadrilateral which has opposite sides parallel.

An illustration of a parallelogram with vertices labeled.

Parallelogram With Vertices Labeled

An illustration of a parallelogram with vertices labeled.

Illustration of a parallelogram with altitude and diagonal drawn.

Altitude and Diagonal of a Parallelogram

Illustration of a parallelogram with altitude and diagonal drawn.

Illustration of parallelogram AEFC drawn two different ways with base b and altitude/height a used to prove the area is aXb.

Area of a Parallelogram

Illustration of parallelogram AEFC drawn two different ways with base b and altitude/height a used to…

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

Parallelogram With Diagonals Bisecting Each Other

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

Parallelogram with dimensions labeled. Parallelogram can be used to calculate area.

Parallelogram With Dimensions

Parallelogram with dimensions labeled. Parallelogram can be used to calculate area.

Parallelogram with dimensions labeled. Parallelogram can be used to calculate area.

Parallelogram With Dimensions

Parallelogram with dimensions labeled. Parallelogram can be used to calculate area.

Illustration to show that when lines from two opposite vertices of a parallelogram to the midpoints of the opposite sides are drawn, they trisect the diagonal.

Parallelogram With Lines From opposite Vertices to Midpoints

Illustration to show that when lines from two opposite vertices of a parallelogram to the midpoints…

Parallelogram with dimensions drawn to show relationship to the area of a rectangle.

Parallelogram and Rectangle Relationship

Parallelogram with dimensions drawn to show relationship to the area of a rectangle.

Illustration of a two equal parallelograms. Two parallelograms are equal, if two sides and the included angle of the one are equal, respectively, to two sides and the included angle of the other.

Equal Parallelograms

Illustration of a two equal parallelograms. Two parallelograms are equal, if two sides and the included…

Polygon consisting of 4 sides

4-sided Polygon

Polygon consisting of 4 sides

Quadrilateral polygon with diagonal drawn.

Quadrilateral Polygon

Quadrilateral polygon with diagonal drawn.

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

Equiangular Polygons

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

Illustration of two polygons. Polygons may be mutually equilateral without being mutually equiangular (except for triangles).

Equilateral Polygons

Illustration of two polygons. Polygons may be mutually equilateral without being mutually equiangular…

Illustration of a quadrilateral, a four-sided figure.

Quadrilateral

Illustration of a quadrilateral, a four-sided figure.

Quadrilateral with intersecting diagonals and segment connecting midpoints.

Quadrilateral With Diagonals and Midpoints Joined

Quadrilateral with intersecting diagonals and segment connecting midpoints.

Illustration of an axis of symmetry drawn with respect to a quadrilateral.

Axis of Symmetry Drawn on a Quadrilateral

Illustration of an axis of symmetry drawn with respect to a quadrilateral.

Illustration of a quadrilateral with diagonals AC and BD.

Quadrilateral With Diagonals

Illustration of a quadrilateral with diagonals AC and BD.

Illustration to show that if the diagonals of a quadrilateral bisect each other, the figure is a parallelogram.

Quadrilateral With Diagonals

Illustration to show that if the diagonals of a quadrilateral bisect each other, the figure is a parallelogram.

Illustrations to show quadrilaterals with lines joining the midpoints of the sides of any quadrilateral, taken in order.

Quadrilaterals With Lines Joining Midpoints

Illustrations to show quadrilaterals with lines joining the midpoints of the sides of any quadrilateral,…

Illustration of a quadrilateral which has two adjacent sides equal and the other two sides equal. It is symmetrical with respect to the diagonal joining the vertices of the angles formed by the equal sides, and the diagonals are perpendicular to each other.

Quadrilateral with Symmetry

Illustration of a quadrilateral which has two adjacent sides equal and the other two sides equal. It…

A rectangle is a parallelogram whose angles are all right angles.

Rectangle

A rectangle is a parallelogram whose angles are all right angles.

A quadrilateral plane figure having four right angles and its opposite sides equal in length. The adjacent sides are unequal.

Rectangle

A quadrilateral plane figure having four right angles and its opposite sides equal in length. The adjacent…

Rectangle with angles labeled. Parallelogram with right angles.

Rectangle

Rectangle with angles labeled. Parallelogram with right angles.

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

Rectangle

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

Rectangle divided into squares to demonstrate area.

Area of a Rectangle

Rectangle divided into squares to demonstrate area.

Rectangle with squares to show area.

Rectangle With Area Squares

Rectangle with squares to show area.

Illustration of a circle inside of a rectangle. The two figures have the same center.

Circle Inside Rectangle

Illustration of a circle inside of a rectangle. The two figures have the same center.

Illustration to show that if the diagonals of a parallelogram are equal, the figure is a rectangle.

Rectangle With Diagonals

Illustration to show that if the diagonals of a parallelogram are equal, the figure is a rectangle.

Rectangle with dimensions labeled. Rectangle can be used to calculate area.

Rectangle With Dimensions

Rectangle with dimensions labeled. Rectangle can be used to calculate area.

A rectangle divided evenly by a dotted line.

Divided Rectangle

A rectangle divided evenly by a dotted line.

Rectangle divided into 7 sections.

Rectangle Divided Into 7 sections

Rectangle divided into 7 sections.

Rectangle divided into 4 sections.

Rectangle Divided Into 4 sections

Rectangle divided into 4 sections.

Illustrations to show that if two parallel lines are cut by a transversal, the bisectors of the interior angles form a rectangle.

Rectangle Formed When Two Parallel Lines are Cut by a Transversal

Illustrations to show that if two parallel lines are cut by a transversal, the bisectors of the interior…

An illustration of a rectangle with lengths a and b and area ab.

Rectangle with Lengths a and b with Area ab

An illustration of a rectangle with lengths a and b and area ab.

An illustration of composite rectangle with lengths a, b, and c with area ac + bc. This illustration represents the product of c(a+b).

Rectangle with Lengths a, b, and c with Areas ac and bc

An illustration of composite rectangle with lengths a, b, and c with area ac + bc. This illustration…

A rhomboid is a parallelogam whose opposite sides are equal, and whose angles are not right angles.

Rhomboid

A rhomboid is a parallelogam whose opposite sides are equal, and whose angles are not right angles.

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

Rhomboid

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

A rhombus is a rhomboid having equal sides.

Rhombus

A rhombus is a rhomboid having equal sides.

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

Rhombus

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

A square is a rectangle whose sides are all of the same length.

Square

A square is a rectangle whose sides are all of the same length.

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

Square

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

Square with diagonal and angles labeled.

Square

Square with diagonal and angles labeled.

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

Square

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

Square with diagonal drawn.

Square With Diagonal

Square with diagonal drawn.

This 24x24 square shows how square root can be taught. It is divided up into 4x4 and 20x20.

Square Roots

This 24x24 square shows how square root can be taught. It is divided up into 4x4 and 20x20.

Illustration of a square constructed upon the sum of two straight lines.

Square Constructed Upon the Sum of Two Straight Lines

Illustration of a square constructed upon the sum of two straight lines.

Illustration of a square constructed upon the difference of two straight lines.

Square Constructed Upon Difference of Lines

Illustration of a square constructed upon the difference of two straight lines.

Illustration of a square constructed upon the difference of two straight lines.

Square Constructed Upon Difference of Lines

Illustration of a square constructed upon the difference of two straight lines.

A square divided evenly by a dotted line.

Divided Square

A square divided evenly by a dotted line.