# Math

## Featured Videos

### How to Add and Subtract Fractions in Algebra (Video)

In algebra, adding and subtracting fractions is easy when you find the common denominator. This video shows you how to convert fractions for the common denominator. After you determine the common denominator, you can add and subtract fractions, including story problems, with ease.

### How to Find the Volume of a Solid with a Circular Cross-Section (Video)

Calculus allows you to calculate the volume of conical objects by dividing the object into an infinite number of circular cross-sections - geometrical shapes resembling pancakes or washers - and adding up the volume of all those cross-sections through integration. This video tutorial shows you how.

## Most Popular

### Mastering the Formal Geometry Proof

Suppose you need to solve a crime mystery. You survey the crime scene, gather the facts, and write them down in your memo pad. To solve the crime, you take the known facts and, step by step, show who committed

### Sizing Up the Area of a Polygon

Not only can polygons be classified by the number of sides they have and by their angles, but they can also be grouped according to some of their qualities. Polygons can have three personality characteristics

### Simple and Easy Geometry Tips and Tools

The first rule of life? Life (as well as geometry) can be difficult. But why make it more difficult than it has to be? Do you need help with geometry? Here are 11 tried-and-true tips to make your forays

### Measuring and Making Angles

On a map, you trace your route and come to a fork in the road. Two diverging roads split from a common point and form an angle. The point at which the roads diverge is the

### Classifying Three Types of Triangles

Triangles are classified according to the length of their sides or the measure of their angles. These classifications come in threes, just like the sides and angles themselves. That is, a triangle has

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### Algebra’s Laws of Logarithms

Logarithms help you add instead of multiply. The algebra formulas here make it easy to find equivalence, the logarithm of a product, quotient, power, reciprocal, base, and the log of 1.

### 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

### 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

### 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

### 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

### 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

### 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

### 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

### 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

### Avoiding Issues When Solving Physics Problems

If you get stumped working on physics formulas, take a deep breath, and recheck your work. Go through these common physics problem issues to make sure you have avoided them:

### Physics Constants

Physics constants, like the mass of a proton or speed of light, are physical quantities with fixed numerical values. This list contains the most common physics constants:

### Important Physics Equations

Physics is packed with formulas and equations. This comprehensive list, arranged by topic, represents essential physics equations you need to keep handy when you're dealing with physics formulas.

### 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

### 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

### 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:

### 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.

### 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

### 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:

### 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

### 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:

### 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

### 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

### 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:

### 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:

### 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:

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