Geometry
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### Interactive

Title | Brief Description | Category | Date |

A Java-based, online version of the Elements | Geometry | 4/7/1996 | |

Dazzle your students with this so-cool animated introductory exercise | Geometry | 10/22/1996 | |

View Autocad files made by TCD students. | Geometry | 12/7/1999 | |

Explore triangles using Java Sketchpad | Geometry | 1/17/2000 | |

Play with the perimeter of boxes. | Geometry | 3/27/2000 | |

Approximate the area of a circle using a grid. | Geometry | 4/1/2000 | |

Fill a rectangular box with cubes. | Geometry | 4/20/2000 | |

Approximate the surface area for the Earth if its radius changed. | Geometry | 8/20/2000 | |

Illustrates the effect of a given matrix on the unit circle. | Geometry | 3/5/2001 | |

Fold this piece of paper into a three dimensional box. | Geometry | 8/3/2001 | |

Produce up to 500 non-trivial Pythagorean Triples. | Geometry | 10/22/2001 | |

Learn about the relationship between a polygon's inner angle and its number of sides. | Geometry | 11/29/2001 | |

Learn about inscribing a regular polygon in a circle. | Geometry | 2/26/2002 | |

Explore the Pythagorean Theorem through regular polygons and circles on the sides of a right triangle. | Geometry | 9/18/2003 | |

Create shapes with a virtual Geoboard. | Geometry | 9/21/2003 | |

Graph a wide range of functions in 3 dimensions. (requires Java3D download) | Geometry | 6/17/2004 | |

Fold this piece of paper into a three dimensional pyramid. | Geometry | 7/29/2004 | |

Graph points in the plane | Geometry | 11/1/2005 | |

A collection of Java Sketches created in Geometer's Sketchpad and saved as Java Applets | Geometry | 2/26/2007 | |

Applet that demonstrates foldings a piece of paper into a cylinder. | Geometry | 4/3/2009 | |

Draw a polygon and then count the sum of its angles. | Geometry | 6/4/2014 | |

Shoot random points at a circle to approximate the value of Pi. | Geometry | 6/16/2014 | |

Find Sin, Cos, Tan, Cosec, Sec, and Cotan for any angle on the unit circle. | Geometry | 6/18/2014 |

### Lessons

Title | Brief Description | Category | Date |
---|---|---|---|

Illustrates the intuitive notion of the tangent plane to a graph of a function of two variables. |
Geometry |
10/22/1995 | |

Supplementary material to help students with their first encounter with vectors. |
Geometry |
10/22/1995 | |

Enjoyable activities involving geometric transformations and image distortion. |
Geometry |
10/29/1995 | |

Learn all about fractals. |
Geometry |
1/19/1996 | |

Find the temperature at a particularpoint of a rectangular plate using statistical methods. |
Geometry |
6/30/1996 | |

A Fractals Lesson for Elementary and Middle School Students |
Geometry |
7/9/1996 | |

A lesson that uses many options for studying tesselations |
Geometry |
10/21/1997 | |

Unit designed to teach surface area and volume |
Geometry |
10/21/1997 | |

This lesson/unit allows an exploration into the ratio that designates a cancerous cell. |
Geometry Geometry |
12/22/1998 | |

This activity includes an Excel file and a Java fileto experiment with interactive triangles. |
Geometry |
12/30/1998 | |

This page offers a Java Program to Generate Pythagorean Triples. |
Geometry |
2/3/1999 | |

This lesson deals with proportions, right triangles and the geometric mean |
Geometry |
3/22/1999 | |

An Introductory Project in Trigonometry using The Geometer's Sketchpad |
Geometry |
2/9/2000 | |

Geometrically show the differences between 2 squares. a*a -b*b=(a-b)(a-b)*(a+b)(a+b) |
Geometry |
2/10/2001 | |

This tool seems very effective for teaching Geometry at remotely located students. |
Geometry |
5/30/2001 | |

Roll dice and see the relationship between sides of a triangle. |
Geometry |
7/3/2001 | |

A lesson to accompany the "Folding a Rectangular Prism" applet |
Geometry |
1/1/2006 |