Introduction

The Internet Resources

Parallel Lines

• Parallel Line and Ratio Applet - Solve parallelism problem using Applet

• Two Perpendiculars Theorem Proof

• Perpendicular to Parallels Theorum Proof - Hotlinks to definitions

• Construct Parallel and Perpendicular Lines - Interactive Gizmo

• Math for Morons Like Us : Parallel Lines - Definition, Explanation, and Diagrams

• Crossing and Parallel Lines

• Parallel Lines : A poem - pretty good!

• Parallel lines in 2 and 3 dimensions - Basic Definition

Congruency

• Transmographer - Rotate, Reflect, and Flip shapes

• Escher Patterns

• Congruency of Triangles

• Geometry and Spatial Sense: Congruency - Definition and animated example

• What Is a Tessellation?

• Perimeter, Area, and Volume Formulas

• Right Angle Congruence Theorem Proof

• Congruent Triangles - Interactive! Build and Examine congruent triangles using sss, asa, ssa, sas

• Transformations - Composition - interactive problem solving

• Transformations- Translation

• Transformations - Rotation

• Transformations - Reflections

Measurements (Perimeter, Area, Surface Area, Volume)

• Erich's Packing Center

• Lessons on the Perimeter and Area of Polygons

• Area and Perimeter Game

• Geometry from AAAmath

• Virtual Geoboard - All the fun of a real geoboard without the danger of flying rubber bands!

• Visual Proof of the Pythagorean Theorem - Walk through it step by step. move everything into place

Similar Figures

• Pythagoras and Similar Figures

• Fundamental Theorem of Directly Similar Figures - Advanced

• Areas of Similar Figures - Basic Ratios

• The Great Cartoon Blowup Activity - Fun activity leads to calculations

• Definition of Similar Figures - Text and Diagrams

• Similar Figure Applet - Move stuff, make similar figures.

• Relations and Sizes: Similar Figures - Explains and offers practice problems

• Transformations- Dilation

Other Useful Math Stuff

• Interactive Tangram

• Geometry in Action - Links to real life applications

• geometry flashcards - very good way to quiz yourself

• Taxi-Cab Geometry - It's challenging and fun. Makes kids think.

• Euclids Elements - Interactive Diagrams and extensive definitions

• Stereograms : A COOL application of Geometry - cool, but complex. could be fun for computer types

• Ask Dr. Math: Geometry

• Online Calculators