The Puerta de Europa towers in Madrid bring parallelograms front and center. These tilted towers, looking like modern-day towers of Pisa seem to defy gravity, but rely on the stability brought about by its quadrilateral structure.

The formula for: Area of a Trapezoid.

This interactive crossword puzzle tests knowledge of key terms on the topic of quadrilaterals.

Use this math game to review quadrilaterals. This is a Memory-style game in which students must remember the location of pairs of identical images.

This is part of a collection of math clip art images about selected topics in Geometry. Also look at our Geometry Basics math clip art collection.

This is part of a collection of math clip art images about selected topics in Geometry. Also look at our Geometry Basics math clip art collection.

This is part of a collection of math clip art images about selected topics in Geometry. Also look at our Geometry Basics math clip art collection.

This is the transcript for the video of same title. Video contents: In this program we explore the properties of quadrilaterals. We do this in the context of two real-world applications.

This is the transcript for the video of same title. Video contents: The Puerta de Europa towers in Madrid bring parallelograms front and center.

The Puerta de Europa towers in Madrid bring parallelograms front and center. These tilted towers, looking like modern-day towers of Pisa seem to defy gravity, but rely on the stability brought about by its quadrilateral structure.

This is part of a collection of math worksheets that are crossword puzzles of math vocabulary.