In this lesson, students will classify quadrilaterals based on parallel and perpendicular lines and the presence or absence of angles of a specified size.

This short video and interactive assessment activity is designed to teach third graders an overview of quadrilaterals.

This short video and interactive assessment activity is designed to give fourth graders an overview of quadrilaterals.

This interactive has a link to read about Quadrilaterals, as well as a place to manipulate and play with quadrilaterals' angles, sides, and diagonals.

In this lesson, students are introduced to different quadrilaterals. Students will discuss and compare rectangles, parallelograms and trapezoids.

Students explore their surroundings to locate and prove the presence of perpendicular lines. Students will use the corner of a ruler as a tester to determine right angles contained in classroom items. It can be included in a unit on geometry and measurement.

In this lesson, students will identify angles found in the real world and classify and draw them. Then they will create a book where they will record angles found within their environment.

In this lesson, students will describe a polygon in a riddle to share with a partner.

In this task, students will apply their knowledge of polygons and their properties to create “New-Fangled Tangram” puzzles.  Students will need to pull from their understanding that polygons may have shared attributes, utilize visual-spatial skills, and employ a variety of problem solving strategies. Additionally, students will need to prove that their puzzles were designed correctly by using a variety of tools and apply fourth grade knowledge of polygons.  This lesson was developed by NCDPI as part of the Academically and/or Intellectually Gifted Instructional Resources Project. This lesson plan has been vetted at the state level for standards alignment, AIG focus, and content accuracy.

This activity is designed to help students overcome the confusion that can arise when they learn that a square is also a rectangle—and a rhombus and a parallelogram. Students create a flowchart to visualize the properties of quadrilaterals. In the finished flowchart, the quadrilateral is at the top and the square is at the bottom, because the square has the greatest number of properties.

This activity gives students the opportunity to use concrete and dynamic representations of the shapes. At the completion of this activity, students will have a discovered a list of properties for each of the six special quadrilaterals. The final page of the quiz enables students to summarize all their findings in a table that can be retained for future use.

This short video and interactive assessment activity is designed to teach third graders an overview of squares and rectangles.

This course was created by the Rethink Education Content Development Team. This course is aligned to the NC Standards for 4th Grade Math. 

This course  was created by the Rethink Education Content Development Team. This course is aligned to the NC Standards for 4th Grade Math. 

This short video and interactive assessment activity is designed to teach third graders an overview: sum of the angles of a triangle.

Visnos is an interactive math website that provides many different math tools to allow teachers to show math visually and allow students to explore with the tools.Visnos can be used with grades one-five as there are activities for telling time, fractions, multiplication tables, subtraction facts, angles, measurement using a protractor.