Texas Instruments
Texas Instruments: Opposite Angles in a Cyclic Quadrilateral
This activity uses Cabri Jr. to discover that opposite angles in a cyclic quadrilateral are supplementary
Texas Instruments
Texas Instruments: Special Midpoint Quadrilaterals
Midpoint Quadrilaterals are quadrilaterals that are formed when consecutive midpoints of a quadrilateral are connected. This activity will use Cabri Jr. to investigate what properties an exterior quadrilateral has if its midpoint...
Texas Instruments
Texas Instruments: Classifying Quadrilaterals
Students receive two Cabri Jr. files of quadrilaterals on a coordinate plane. They use their knowledge of quadrilaterals to give each one the most precise name. They may find the length and/or slope of the sides using the measuring tools...
Texas Instruments
Texas Instruments: Perimeters, Areas, and Slopes Oh, My!
In this activity, students create geometric figures, and use analytic and coordinate geometry to investigate their attributes. They go through the process of proving that a quadrilateral is a parallelogram.
Math Slice
Math Slice: Geometry Slice Special Test
A succinct test for assessing geometry concepts. Assessment is scored online giving immediate feedback. An excellent assessment tool.
The Math League
The Math League: Figures and Polygons
This site provides definitions of different types of polygons and figures.
Beacon Learning Center
Beacon Learning Center: Quad Squad
This interactive lesson investigates quadrilaterals and provides students with an opportunity to practice describing their attributes.
Ministry of Education and Universities of the Region of Murcia (Spain)
Ministerio De Educacion Y Ciencia: Los Cuadrilateros
In Spanish. Interactive resources and activities that could be used in the classroom either as an introduction or review to a unit dealing with area and perimeter of quadrilaterals.
Ministry of Education and Universities of the Region of Murcia (Spain)
Ministerio De Educacion Y Ciencia: Areas Y Cuadrados
Reinforce your knowledge of the area of a quadrilateral by practicing with theses interactive activities.
Jim Loy
Jimloy.com: Saccheri
This site explains the Saccheri quadrilateral and the importance of his work in geometry.
Other
Gvsu: Quadrilateral Hunt
The learning activity asks students to identify quadrilaterals by characteristics rather than appearance. Learners drag the vertices of the shape to reveal the true shape of the quadrilateral. [Requires Java.]
Other
Generalization
Learn how to construct convex polygons and the mathematical foundations of symmetry on this site.
Quia
Quia: Polyatomic Ions Quiz
This site gives you a little Quiz about how much you really know about polygons.
Cut the Knot
Cut the Knot: Geoboard
Students can use the interactive geoboard to create different types of quadrilaterals and investigate the properties of quadrilaterals. Requires Java. The geoboard can also be downloaded for offline use.
Texas Instruments
Texas Instruments: Constructing Quadrilaterals
In this activity, students will construct different types of quadrilaterals from the quadrilateral hierarchy. This activity asks for constructions based on a minimal definition of the quadrilateral. The activity will reinforce the...
Texas Instruments
Texas Instruments: Slide Along
In this activity, students use the Geoboard to determine the areas of quadrilaterals between parallel lines. [Requires Adobe Reader.]
Scholastic
Scholastic: Study Jams! Math: Geometry: Classify Quadrilaterals
After you explore the step by step lesson to classify quadrilaterals sing some karaoke and then test your knowledge.
Math Open Reference
Math Open Reference: Quadrilaterals
A complete reference guide to quadrilaterals including squares, rectangles, parallelograms, trapezoids, and rhombus. It provides definitions and interactive activities that enhance further explanation.
Illustrative Mathematics
Illustrative Mathematics: 2.g Representing Half of a Rectangle
In this lesson plan, 2nd graders are to determine what half of a rectangle is.
Illustrative Mathematics
Illustrative Mathematics: 6.ee Rectangle Perimeter 2
This task is a natural follow up for task Rectangle Perimeter 1. After thinking about and using one specific expression for the perimeter of a rectangle, they now extend their thinking to equivalent expressions for the same quantity....
Illustrative Mathematics
Illustrative Mathematics: 6.ee Rectangle Perimeter 1
This tasks gives a verbal description for computing the perimeter of a rectangle and asks the students to find an expression for this perimeter. They then have to use the expression to evaluate the perimeter for specific values of the...
Illustrative Mathematics
Illustrative Mathematics: 6.ee Rectangle Perimeter 3
The purpose of this task is to ask students to write expressions and to consider what it means for two expressions to be equivalent. Aligns with 6.EE.A.
Mangahigh
Mangahigh: Shape: The Angles Inside a Quadrilateral
Test your knowledge of the sum of angles inside a quadrilateral.