### Nutshell Math

This video lesson shows how to prove triangles are similar by proving congruence of angles and how to use proportional reasoning to find the length of a missing side.

### Free Math Help

This site has links to a variety of sites which will help you with this unit.

Read the instructions and examples, then try it on your own.

### Homeschool Math

This site is full of all kinds of interactive sites.

### Free Math Help

Under Videos, scroll down to Congruent Triangles (proving), and watch to find out how to write a congruency statement.

### Regents Prep

Box #1 has problems you can practice with to be sure you're familiar with the terms you'll need for your test. The rest of the problems have great challenge problems for finding angle measures.

### Free Math Help

You'll see this skill in the challenge section.

### Math Open Ref

This site lets you manipulate similar triangles to explore thier relationships.

### MathStuff

This is a great site to study lesson 5-1. It gives great examples and explanations of all of the new vocabulary that we're learning about.

### One Web

This will give you extra practice in constructing congruent triangles.

### AAA Math

Scroll down to find lessons on complementary and supplementary angles as well as lots of good review on other geometry topics.

### NLVM

Read the directions on the right. Then find the number of faces, edges, and vertices for each of the solids. Record them on a table in your math journal.

### Worsley School

Go here for great descriptions and examples. Click the quiz to test your skills. Your score will be emailed back to you within 2-3 days (Sammy's came back!)

Another site that lets you explore similar figures, then try them on your own.

### AAA Math

A great site for review and practice.

### Math Open Ref

This site has movies about how to draw all sorts of geometric shapes with the help of a compass. For your assessment, you'll need to be able to copy line segments, angles, triangles, construct parallel lines, and angle bisectors, and bisectors of line segments. Contstructing squares will be a challenge.

### Free Math Help

This site has more description of how to find the interior angles of any given polygon.

Get extra practcice constructing congruent triangles.

### Lexington Public Schools

This is a great game to play for a review of previously learned concepts.

### Cool Math 4 Kids

This site gives discriptions and illustrations of several ways to determine the interior angle measure for any polygon.

### National Library of Virtual Manipulatives

Construct contruent triangles. Be sure to click the buttons at the bottom to get practice with all three ways.

### Shodor Interactive

Practice angle names and finding alternate interor/exterior angles.

Determine which colors will be on opposite faces of a cube when the net is folded.

### unitedstreaming

If you're curious about how the geometric constructions we're doing in class apply to the real world, this video has some great examples.

### APlusMath

Match geometric shapes to their names.

### Math Open Reference

This is another animated example of how to use a compass and straight edge to make a construction.

### Math is Fun

Learn the names and properties of various polygons as well as the formula for calculating the sum of the measure of internal angles.

### Ambleside

This is a great site if you have gotten rusty about how to use a protractor.

### Free Math Help

Scroll down to find the movie.

### Cool Math 4 Kids

This site has a good explanation of how to find the sum of the interior angles of any polygon using diagonals and the measure of the interior angles of a triangle.

### Ambleside

This is one of the best online protractor sites I've seen. Great practice!

### Math Tools

This site has links to several of the topice we've worked on in Unit 3.

### Proving Parallel Lines

This site gives examples of how you can prove that two lines are parallel. You'll have a question about this on your test!

### AAA Math

Scroll down to find lessons on classifying triangles by sides and angles, coplementary and supplementary angles, and many other topics.