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Teachers & SchoolsStudy Guide

Who put Geometry in my Pre-Algebra and who put Pre-Algebra in my Geometry? It's like one of those serendipitous accidents: Geometry and Pre-Algebra actually go together. **Geometry** rocks. It's fun. Cool, even. There, we said it.

If you're not a fan of numbers, then geometry still might win you over to math. It has intriguing puzzles, interesting real-world uses, and beautiful 2-D and 3-D shapes. (No uncomfortable 3-D glasses required!)

**Geometry Bingo**

This Bingo style game will help you memorize all those confusing polygon and basic geometry terms.

**What's my angle?**

This is a nifty tool to help measure angles. The make-an-angle tool is really nice for teaching you how to use a protractor!

**Angles**

Help the robot destroy UFO’s with this silly little game that classifies angles as acute, obtuse, or right.

**Geometric Matching**

Use this matching game to practice classifying different types of triangles.

**Angle Sums**

Explore the sum of the interior angles of polygons from triangles to octagons.

**Dynamic Paper**

This dynamic paper is a great source for teachers and students. You can create geometric figures, nets, tesselations, number lines, grids, spinners, and graph paper and download it to your computer to print. A very neat tool!

**Shape Sorter**

Sort shapes into Venn diagrams according to their angles and sides.

**Shape Tool**

Reflect, rotate, and translate different polygons using this tool.

**Blow 'em up cartoons**

This is a lesson plan for teachers or parents to use to teach similar figures. In this activity, you will blow up a cartoon character and draw it using grids.

**Similar and Congruent Figures**

Sort the pairs of shapes as congruent, similar, or neither.

**Interactive Geometry Dictionary**

This is a nice visual representation of the areas of rectangles, parallelograms, and triangles. It would be a nice addition to a teacher-led demonstration on area.

**Area Tool**

This tool allows students to discover the formulas for area of trapezoids, parallelograms, and triangles by changing their height and base.

**Circle Tool**

See how area and circumference of a circle relate in this interactive lesson. This exploration has it all: guided teaching, student discovery, and practice problems!

**Computing Pi**

Two visual representations of how to compute pi.

**Cube Nets**

Which of these nets will form a cube?

**Geometric Solids**

Explore the relationship between the number of faces, edges, and vertices of various geometric solids using this tool.

**Isometric Drawing Tool**

Construct images of 3D figures using this nifty drawing tool.

**Proof Without Words: Pythagorean Theorem**

A look at how the Pythagorean Theorem works. This is probably best as a teacher-led lesson.