Clipart illustrations of a variety of quadrilaterals. Quadrilaterals are 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.
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Area of Parallelogram
"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... |
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Area of Trapezoid
"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... |
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Area of Trapezoid
"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... |
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Concentric Rectangles, Circle Inside
Illustration of a circle inside of 2 concentric rectangles whose vertices are connected by line segments.... |
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Diagonals, Parallelogram With
Illustration of a parallelogram with diagonals AC and BD intersecting at point O.... |
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Figures, similar
2 squares that are similar figures... |
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Figures, similar
2 rectangles that are similar figures... |
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Magic Square
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 tha... |
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Parallelogram
"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... |
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Parallelogram
Parallelogram with angles labeled.... |
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Parallelogram
Illustration of a parallelogram, a quadrilateral which has opposite sides parallel.... |
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Parallelogram
An illustration of a parallelogram with vertices labeled.... |
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Parallelogram, altitude and diagonal of
Illustration of a parallelogram with altitude and diagonal drawn.... |
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Parallelogram, Area of
Illustration of parallelogram AEFC drawn two different ways with base b and altitude/height a used to prove the area is aXb.... |
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Parallelogram, diagonals bisecting
Illustration of a parallelogram with diagonals drawn to show they bisect each other.... |
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Parallelogram, dimensions of
Parallelogram with dimensions labeled. Parallelogram can be used to calculate area.... |
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Parallelogram, dimensions of
Parallelogram with dimensions labeled. Parallelogram can be used to calculate area.... |
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Parallelogram, lines from vertices to midpoints
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.... |
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Parallelogram, Relationship with rectangle
Parallelogram with dimensions drawn to show relationship to the area of a rectangle.... |
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Parallelograms, equal
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.... |
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Polygon, 4-sided
Polygon consisting of 4 sides... |
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Polygon, quadrilateral
Quadrilateral polygon with diagonal drawn.... |
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Polygons, equiangular
Illustration of a two polygons. Polygons may be mutually equiangular without being mutually equilateral.... |
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Polygons, equilateral
Illustration of two polygons. Polygons may be mutually equilateral without being mutually equiangular (except for triangles).... |
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Quadrilateral
Illustration of a quadrilateral, a four-sided figure.... |