Learn about the properties of 2-D shapes: circles, triangles, polygons, and quadrilaterals. Includes information, video, and examples about each, with games and quizzes for reinforcement.

The learners will explore angles, rays, line segments, perpendicular lines, parallel lines, and two-dimensional figures through the use of the book Shape Up! Fun With Triangles and Other Polygons by David A. Adler. They will also...

MathWorld provides multiple definitions and formulas for the mathematical term, square.

In the pictured quadrilateral, opposite sides are congruent and students must explain whether this makes it a parallelogram. Aligns with G-CO.C.11.

Practice finding the areas of complex shapes that are composed of smaller shapes. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.

In this instructional activity on 2D shapes, 3rd graders will learn to discriminate quadrilaterals from other polygons. Additionally, they will be able to identify attributes of a square, rectangle, and rhombus.

Students solve for missing angle measures by applying what they have learned about types of angles and the angle measures of polygons. Students do a pre-assessment at the end of the lesson.

A comprehensive tutorial from AAA Math that contains explanations, interactive practices and challenging games.

[Free Registration/Login Required] Students will move the points on the parallelogram to explore what happens to the slope. Click learn more to watch a video and click challenge me to answer a practice question.

[Free Registration/Login may be required to access all resource tools.] Students watch a video tutorial and attempt practice problems on identifying the properties of rectangles.

[Free Registration/Login may be required to access all resource tools.] Students watch a video overview and attempt practice problems on identifying the properties of squares.

Explains the basic concept of parallelograms with step-by-step instructions and methods for solving specific problems on your own relating to this topic.

Explains the basic concept of a square with step-by-step instructions and methods for solving specific problems on your own relating to this topic.

Learn about trapezoids with this helpful reference tool. Provides a detailed definition, examples, and interactive activities that enhance further explanation. Includes links to related topics.

Learn about the interior angles of a parallelogram with this helpful reference tool. Provides a detailed definition, examples, and an interactive activity that enhances further explanation. Includes links to related topics.

[Free Registration/Login may be required to access all resource tools.] In this lesson students find the area of a parallelogram given its base and height. Students examine guided notes, review guided practice, watch instructional videos...

A comprehensive list of 2D shapes and 3D solids with everything from a triangle to a dodecahedron. Includes illustrations and short descriptions of attributes for each.

In this mini-instructional activity, you will learn about the definition of geometric shapes and view many examples. You can check out the interactive simulations to know more about the instructional activity and try your hand at solving...

In this instructional activity on area and perimeter, 3rd graders will learn how to find the area and perimeter of rectangles by applying formulas.

This review lesson about basic shapes (polygons)contains varied hands-on exercises and tilings about triangles, quadrilaterals, pentagons, and hexagons.

Brush up on your math skills relating to the area of trapezoids then try some practice problems to test your understanding.

Brush up on your math skills relating to the area of parallelograms then try some practice problems to test your understanding.

Brush up on your math skills relating to the area of rhombuses then try some practice problems to test your understanding.

Brush up on your math skills relating to the area of rectangles then try some practice problems to test your understanding.