This applet allows users to study the nature of triangles and their area. It draws random triangles on a Cartesian coordinate system. The user can determine the area of the triangle using his or her preferred method. After the calculated...

This lesson plan reviews transformations in the coordinate plane while mimicking real-world planning skills. It gives an assessment and ideas for remediation, extention as well as ways to manage behavior problems and reluctant learners.

Discover how the geometric shape of an object directly relates to its usefullness in this math challenge from the NCTM Math Challenges for Families collection. A one page activity that you can print or download.

Step by step, this video lesson [2:41] will show you how to add up the number of squares that cover an object in order to find the area of a figure. It is 3 of 7 in the series titled "Finding Area with Squares."...

In Spanish. In this site you will find different activities involving geometric plane figures.

Students learn how to categorize plane figure polygons using Venn Diagrams with this computer based tool.

This hands-on lesson uses exploration and discovery to help students determine the coordinates of the vertices of various figures when translated, rotated, or reflected in a coordinate plane. The exploration phase will access students'...

Try to find the line of symmetry of these 8 figures. If you find it the two figures should coincide.

[Free Registration/Login may be required to access all resource tools.] This concept teaches students to classify quadrilaterals in the coordinate plane.

Explore pentominoes by determining congruent and non-congruent shapes.

[Free Registration/Login may be required to access all resource tools.] The video shows how to count the number of straight lines and curves in a given 2D figure. The video is followed by practice problems.

The students will find the area of each two dimensional figure on a net of a rectangular prism. In groups, students will cut out the net and create a rectangular prism. Groups will then discuss how to find the lateral area and the total...

Explore finding and measuring perimeter of figures.

Given two figures on the coordinate plane, find the formal definition of the translation that takes one figure to another. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video, or...

Given a figure on the coordinate plane and the definition of a rotation about an arbitrary point, draw the image of that rotation. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video,...

In this lesson plan on transformations and congruence, 8th graders will investigate dilations, rotations, reflections, and translations on the coordinate plane and the figures that result from these transformations.

Given a figure and a definition of a translation, draw the image. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video, or receive hints.

Find the reflection that maps a given figure to another and draw the image of a reflection. The lines of reflection in this exercise have a wide range of slopes. Students receive immediate feedback and have the opportunity to try...

This website has basic definitions for most polygons, regular and irregular.

The resource consists of area formulas and diagrams for a variety of shapes.

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.

The plane crash, in Smolensk, Russia, killing the Polish President, first lady and key figures in the Polish government, has created an enormous gap in the leadership of the country. This article, briefly discusses the country's reaction...

Given geometric figures on the coordinate plane, the student will apply the definition of congruence, in terms of rigid transformations, to identify congruent figures. The student will also identify and distinguish between reflectional...

A math investigation that uses scatter plots to compare prices of favorite soft drinks. Discover how valuable your skills in organizing and displaying data can be in real life scenarios.