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### Geometry Formulas for Polygons

Polygons, those many-sided objects so popular in geometry circles, are subject to their own formulas that help you find the area and angles of various geometrical shapes. Have a look at the most common [more…]

### Coordinate Geometry Formulas

When you work in geometry, you sometimes work with graphs, which means you’re working with *coordinate geometry.*Becoming familiar with the formulas and principles of geometric graphs makes sense, and you [more…]

### Geometry Symbols

If you’re studying geometry, you’re seeing symbols everywhere — symbols for arcs and angles, lines and triangles as well as symbols for the relationships between lines and angles and so on. Following is [more…]

### Triangle Terminology for Geometry

Triangles are at least a third of geometry (tri = three . . . a little geometry humor). But, seriously, the sides and angles of triangles may have all sorts of relationships to each other, and the following [more…]

### Geometry Formulas for 3-D Objects

You know those big, 3-D movie blockbusters? They’d be nowhere without geometry . . . geometry and those weird glasses. Knowing the formulas for 3-D objects is key in the real world of geometry, and those [more…]

### Geometry Formulas and Rules for Triangles

The three-angled, two-dimensional pyramids known as triangles are one of the building blocks of geometry (however three-cornered they may be). Triangles, of course, have their own formulas for finding [more…]

### Geometry Formulas and Theorems for Circles

Geometry isn't all about pointy angles — there are circles, too. What’s interesting about circles isn’t just their roundness: Become familiar with geometry formulas that help you measure angles around [more…]

### Geometry Workbook For Dummies Cheat Sheet

The helpful geometry symbols, formulas, and principles in this cheat sheet ease your learning curve. Working with geometry means never being bored: You get to work with lines, angles, and arcs; triangles [more…]

### Hit List of Geometry Formulas

These important formulas, theorems, and properties are vital to studying geometry. If you're working on a geometry problem and get stumped, go through these formulas and make sure you've applied them correctly [more…]

### Common Geometry Symbols

Using geometry symbols will save time and space when writing proofs, properties, and figuring formulas. The most commonly used geometry symbols and their meanings are [more…]

### Proof Strategies in Geometry

Knowing how to write two-column geometry proofs provides a solid basis for working with theorems. Practicing these strategies will help you write geometry proofs easily in no time: [more…]

### Geometry For Dummies Cheat Sheet

Successfully understanding and studying geometry involves using strategies for your geometry proofs; knowing important equations; and being able to identify commonly used geometry symbols. [more…]

### TI-83 Plus Graphing Calculator: Math Functions and Constants

You have a TI-83 Plus graphing calculator because you need to do math functions. The TI-83 Plus calculator helps you out by coming with pre-set buttons for constants, such as ð [more…]

### Set Up a Graph with the TI-83 Plus Calculator

The purpose of having a TI-83 Plus graphing calculator is to help you graph, right? Peruse the basics of how to get the TI-83 Plus calculator into graphing mode, how to format the graph, and so on: [more…]

### Zoom Functions on the TI-83 Plus Graphing Calculator

Z is for *zoom,* on a TI-83 Plus graphing calculator. In addition to helping you design a graph, your TI-83 Plus calculator can zoom into a section and redraw a graph to meet different criteria. Discover [more…]

### Special Menus on the TI-83 Plus Graphing Calculator

The TI-83 Plus graphing calculator has all sorts of menus, from drawing to financial to probability. Explore these special menus on your TI-83 Plus calculator by checking out this list: [more…]

### Important Keystrokes for the TI-83 Plus Graphing Calculator

Get the most from your TI-83 Plus graphing calculator by knowing some important keystrokes. With the TI-83 Plus calculator, you can insert or delete symbols, add a value to a variable, evaluate expressions [more…]

### TI-83 Plus Graphing Calculator For Dummies Cheat Sheet

The TI-83 Plus graphing calculator is designed to make graphing easy. The buttons on the TI-83 Plus calculator help you set up a graph, give you access to math constants, and zoom in on different aspects [more…]

### Grouping Numbers for Easy Addition

If you’re looking for a quicker way to do addition, use this chart to group numbers. Put your list of numbers on paper and then follow this example: [more…]

### Using Basic Math for Tipping

These basic tipping rules apply to meals in the $20 to $100 price range, which covers almost 90 percent of restaurant meals for two in the U.S. Apply these simple math rules to your check total: [more…]

### Getting to Know Pythagoras’ Theorem

An earlier version of Pythagoras’ theory existed in ancient civilizations, but only for particular triangles. The Pythagoras’ theorem expanded this earlier version, try the proof for yourself: [more…]

### Using Everyday Math in Everyday Life

Whether you’re dealing with your everyday finances, or getting together for a neighborhood card game, you need to know basic math to help you simplify and stay on top of your money matters. [more…]

### Basic Math Formulas

If you’re looking to find the area or volumes of basic shapes like rectangles, triangles, or circles, keep this diagram handy for the simple math formulas: [more…]

### Everyday Math For Dummies Cheat Sheet

Everyday math comes in handy when you’re dealing with finances like credit cards and mortgages, and even helps when you’re trying to figure out how much to leave for a tip. Knowing some basic math formulas [more…]

### How to Multiply Two Mixed Numbers

Knowing how to multiply fractions will help when it comes to multiplying two mixed numbers. This is because when multiplying mixed numbers, you first have to change them to improper fractions. You then [more…]