Other
American Mathematical Society: The Mathematical Cat Scan
Diagrams and discussion of the "collection of 1-dimensional records" that make up a CAT scan.
That Quiz
That Quiz: Figuras
This interactive activity is designed for the student to review different geometric planes figures.
National Council of Teachers of Mathematics
Nctm: Figure This: Fire Hydrant
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.
SMART Technologies
Smart: Polygons
This SMART Notebook lesson allows students to characteristics of polygons by exploring vocabulary and sample problems.
Integrated Publishing
Plane Figures
This site describes lines and angles "as found in various plane (flat) geometric figures.".
Alabama Learning Exchange
Alex: Quadrilaterals
This is an inquiry lesson plan used to review Algebra 1 objectives by applying them to geometry concepts. Students explore the properties of quadrilaterals and classify them by definition. This lesson plan can be use in geometry classes....
Mocomi & Anibrain Digital Technologies
Mocomi: What Is Circle?
Discusses the radius, diameter, circumference, and area of a circle.
Mocomi & Anibrain Digital Technologies
Mocomi: What Is a Polygon?
Defines polygons and explores characteristics, types of polygons, and how to calculate the area of a polygon.
Mocomi & Anibrain Digital Technologies
Mocomi: What Are Triangles?
Learn all about triangles with the help of this downloadable mathematics worksheet.
National Council of Teachers of Mathematics
The Math Forum: Plane Figure
This site provides a definition for plane figure (at the top of the page) and a few examples.
Shodor Education Foundation
Shodor Interactivate: Shape Explorer: Area and Perimeter
An applet activity that provides an exercise in working with perimeter and area of 2D objects. The user is given a random figure and allowed to enter a value for the area and perimeter. Use the "How" and the "Why" button to assist you....