The Quadrilaterals ClipArt gallery offers 94 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.

### Area of Parallelogram

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

### Area of Trapezoid

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

### Area of Trapezoid

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

### Circle Inside Concentric Rectangles

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

### Parallelogram With Diagonals

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

### Similar Figures

2 squares that are similar figures

### Similar Figures

2 rectangles that are similar figures

### Magic Square

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

### Parallelogram

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

### 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.

### Area of a Parallelogram

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

### Parallelogram With Diagonals Bisecting Each Other

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

### Parallelogram With Dimensions

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 Lines From opposite Vertices to Midpoints

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

### Parallelogram and Rectangle Relationship

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

### 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

### 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.

### Quadrilateral With Diagonals and Midpoints Joined

Quadrilateral with intersecting diagonals and segment connecting midpoints.

### 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.

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

### 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…

An example of a quadrilateral used to find its area.

### Rectangle

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

### Rectangle

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

### Rectangle

Rectangle with angles labeled. Parallelogram with right angles.

### Rectangle

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

### Area of a Rectangle

Rectangle divided into squares to demonstrate area.

### Rectangle With Area Squares

Rectangle with squares to show area.

### Circle Inside Rectangle

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

### Rectangle With Diagonals

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

### Rectangle With Dimensions

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

### Divided Rectangle

A rectangle divided evenly by a dotted line.

### Rectangle Divided Into 7 sections

Rectangle divided into 7 sections.

### Rectangle Divided Into 4 sections

Rectangle divided into 4 sections.

### 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…

### Rectangle with Lengths a and b with Area ab

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

### 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…

### Rhomboid

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

### Rhomboid

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

### Rhombus

A rhombus is a rhomboid having equal sides.

### Rhombus

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

### Square

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

### Square

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

### Square

Square with diagonal and angles labeled.

### Square

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

### Square With Diagonal

Square with diagonal drawn.

### Square Roots

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

### Square Constructed Upon the Sum of Two Straight Lines

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

### Square Constructed Upon Difference of 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.