These sites are about crop circles. Read general information about crop circles, including its history and different theories on how they are created, as well as a design aspect. Find out how to create crop circles using geometric knowledge and how to implement them on fields. Includes a photo gallery, lesson plans, and interactive reconstructions. There are also links to eThemes Resources on symmetry and circumference of geometry.
A two-page PDF file shows how mathetical patterns are related to crop cirle. There is also a step-by-step illustration of how to reconstruct the crop circle using GeoGebra. Scroll down to a link to download a software.
Learn how to construct the basics in geometry. Choose the mathemeical basics from a menu on the right and then click on bar in the middle to see interactive step-by-step illustration. NOTE: A flash-plug-in is reqired to view this page.
These sites offer many examples of how symmetry works in a variety of shapes. Find out the difference between reflection and rotational symmetry. Includes interactive sites that let you draw symmetrical shapes and manipulate them. There is a link to an eThemes Resource on tessellations.
Learn how to calculate the circumference of a circle also known as a perimeter of a circle. Find out what radius and diameter are and how to find their values. There are links to eThemes resources on perimeter.