Circles

Popular Tutorials in Circles

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!
How Do You Find the Circumference of a Circle if You Know the Radius?

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!
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!
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!
How Do You Find the Radius of a Circle if You Know the Area?

Want to find the radius of a circle? Already have the area? Then you can use the formula for the area of a circle to solve! This tutorial shows you how to use that formula and the given value for the area to find the radius. Take a look!
How Do You Find the Area of a Circle if You Know the Diameter?

If you have the diameter 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!
How Do You Find the Area of a Sector of a Circle?

Trying to find the area of a sector of a circle? Then check out this tutorial! You'll see how to use given information and the formula for the area of a sector to find the answer. Take a look!
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!
What is Pi?

Some numbers are just so cool that they get their own tutorial. Take the irrational number pi. This number is simply a ratio, but people have been working for years to find more and more digits of pi. Check out this tutorial to learn about pi!
What is a Sector and Central Angle?

Just about everything in math has a name! Did you know that a fraction of the area of a circle is known as a sector? This tutorial introduces you to the term sector and gives you examples of sectors. Take a look!
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!
What is the Formula for the Area of a Circle?

Did you know that you can figure out the formula for the area of a circle by first turning the circle into a parallelogram? It seems a little weird, but it really works! Watch this tutorial to see how it's done!
What is the Formula for the Area of a Sector of a Circle?

A sector is just a fraction of the area of a circle. Did you know that there's a formula to help you find the area of a sector? In this tutorial, you'll learn how to find that formula! Take a look!