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 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.