Real math help.
How Do You Find the Circumference of a Circle if You Know the Radius?
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Trying to find the circumference of a circle? Know the radius? Then you can use the formula for the circumference of a circle to get the answer! Just plug the value for the radius into the formula and solve. This tutorial shows you how!
Background Tutorials
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Decimal Operation Problems
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How Do You Multiply Decimals?
Doing math with paper and pencil can come in real handy, so make sure you're comfortable multiplying decimals by hand. After all, you don't want the calculator to be a crutch!
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Evaluating Expressions
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How Do You Evaluate an Algebraic Expression?
Plugging variables into an expression is essential for solving many algebra problems. See how to plug in variable values by watching this tutorial.
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What is a Variable?
You can't do algebra without working with variables, but variables can be confusing. If you've ever wondered what variables are, then this tutorial is for you!
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Circle Definitions
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What is a Circle?
Circles are a fundamental part of math! In this tutorial, you'll be introduced to circles and see the different parts of a circle such as the diameter, radius, and chord. Check out this tutorial to learn about circles!
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Circumference
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What is Circumference?
The circumference of a circle is the distance around that circle. But what is the formula to find the circumference? In this tutorial, you'll learn the formulas for the circumference of a circle. Take a look!
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Further Exploration
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Circumference
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How Do You Find the Circumference of a Circle if You Know the Diameter?
Trying to find the circumference of a circle? Know the diameter? Then you can use the formula for the circumference of a circle to get the answer! Just plug the value for the diameter into the formula and solve. This tutorial shows you how!
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How Do You Find the Radius of a Circle if You Know the Circumference?
Want to find the radius of a circle? Already have the circumference? Then you can use the formula for the circumference of a circle to solve! This tutorial shows you how to use that formula and the given value for the circumference to find the radius. Take a look!
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Areas of Circles and Sectors
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How Do You Find the Area of a Circle if You Know the Radius?
If you know the radius of a circle, you can use it to find the area of that circle. Just plug that value into the formula for the area of a circle and solve. Watch this tutorial to see how it's done!
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