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. 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

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…  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. 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

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

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.