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.
CK-12 Foundation
Ck 12: Geometry: Trapezoids and Kites Study Guide
[Free Registration/Login may be required to access all resource tools.] This study guide looks at properties and theorems about trapezoids and kites.
Alabama Learning Exchange
Alex: What Do We Have in Common?
This inquiry lesson explores the definitions of quadrilaterals and the properties of the diagonals of quadrilaterals to classify quadrilaterals. Learners will work cooperatively to justify conclusions. This lesson plan was created by...
CK-12 Foundation
Ck 12: Geometry: Inscribed in Circles Study Guide
This study guide on circles covers some vocabulary terms, and inscribed angles and polygons. It is available for download with free registration.
PBS
Pbs: Mathline: Tessellations Wow! [Pdf]
An integrated geometry lesson on spatial sense in which students identify and use different shapes to create a tessellation. "Through a variety of modalities such as writing, music, art, poetry, and literature, students are introduced to...
CK-12 Foundation
Ck 12: Geometry: Kites
[Free Registration/Login may be required to access all resource tools.] Apply the properties of kites.
CK-12 Foundation
Ck 12: Geometry: Kites
[Free Registration/Login may be required to access all resource tools.] This concept teaches students the properties of kites and how to apply them.
CK-12 Foundation
Ck 12: Geometry: Parallelograms
[Free Registration/Login may be required to access all resource tools.] This concept teaches students properties of and theorems about parallelograms and how to apply them.
CK-12 Foundation
Ck 12: Geometry: Trapezoids Grades 9 10
[Free Registration/Login may be required to access all resource tools.] This concept will teach students to use and apply the properties of trapezoids.
CK-12 Foundation
Ck 12: Geometry: Polygon Classification
[Free Registration/Login may be required to access all resource tools.] Recognize and classify different polygons
CK-12 Foundation
Ck 12: Geometry: Parallelograms
[Free Registration/Login may be required to access all resource tools.] Apply parallelogram theorems.
Geometry Help
Geometry Help: Rectangles
Explains the basic concept of a rectangle with step-by-step instructions and methods for solving specific problems on your own relating to this topic.
Ministerio de Educacion, Cultura y Deporte (Spain)
Cnice: Relacion De Ejercicios Interactivos.
In Spanish. Interactive activities online on various geometric and trigonometric concepts such as area, perimeter, secants, tangents, etc. A terrific resource for students. Site is organized acoording to shape. (triangle, quadrilaterals,...
Jim Loy
Jimloy.com: Saccheri
This site explains the Saccheri quadrilateral and the importance of his work in geometry.
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.
CK-12 Foundation
Ck 12: Kites
[Free Registration/Login Required] Students will move the vertices of the kite to explore how to change the shape of quadrilaterals. Click learn more to watch a video and click challenge me to answer practice question.
Khan Academy
Khan Academy: Use Pythagorean Theorem to Find Area and Perimeter
Find the area and perimeter of triangles and quadrilaterals by first using the Pythagorean Theorem to find missing side lengths. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video, or...
ClassFlow
Class Flow: Segments and Polygons
[Free Registration/Login Required] This flipchart reviews segments, parallel and perpendicular lines and then introduces polygons including quadrilaterals. It has many real world examples of shapes and includes Activote assessment.
Texas Instruments
Texas Instruments: Investigating Area Relationships
The interactive Cabri Jr. geometry application makes it easy to measure the area of triangles and quadrilaterals. In this activity, students will explore some interesting area relationships in quadrilaterals.
Alabama Learning Exchange
Alex: Geometrica Fights Back!
This activity is designed to give learners practice with the properties of special quadrilaterals (parallelograms, rectangles, rhombuses, squares, trapezoids, and kites). The students are provided with a "murder mystery" sheet with...
Better Lesson
Better Lesson: What Makes a Shape? Analyzing and Script Writing
Third graders will use the bat houses we built as examples of various quadrilaterals.
Geometry Help
Geometry Help: Kites (Deltoids)
Explains the basic concept of kites with step-by-step instructions and methods for solving specific problems on your own relating to this topic.
Quia
Quia: Polyatomic Ions Quiz
This site gives you a little Quiz about how much you really know about polygons.