Curated OER
What's an Irrational Number?
This video defines rational numbers. Through the definition and examples, learners should comprehend that irrational numbers are numbers that cannot become simple fractions. The video uses examples of very common irrational numbers, such...
Curated OER
What is the Formula for the Volume of a Cylinder?
Finding the volume of a cylinder entails using two formulas: the formula for the area of a circle and the formula for volume. The area of the given circle must be solved because that value is used in the formula for volume. Watch this...
Curated OER
How Do You Find the Volume of a Sphere?
The formula for the volume of a sphere is volume equals four-thirds pi times the radius cubed. That's a mouth-full. But if you are given the radius value of the sphere, all you have to do is plug it in and do the arithmetic. Just...
Curated OER
How Do You Find the Volume of a Cylinder?
What is the formula to find the volume of a cylinder? Here's the formula - volume equals base times height, and the base of a cylinder is base equals pi times radius squared. If the is a given value for radius, and a given value for...
Curated OER
How Do You Find the Surface Area of a Sphere?
What do a basketball, a bowling ball, and a ping pong ball all have in common? They are spheres. So how do you measure the surface area of a sphere? Yes, there is a formula and all you have to do is know one measurement of the sphere to...
Curated OER
What is Circumference?
There are actually two formulas to find the circumference of a circle. One formula is based on knowing the diameter of the circle, and the other is based on knowing the radius of the circle. The instructor illustrates both formulas. She...
Curated OER
How Do You Find the Circumference of a Circle if You Know the Diameter?
There are two formulas that can be used to find the circumference of a circle. Choose the appropriate formula depending on the given value in the problem. After selecting the correct formula, solve the problem using 3.14 as an estimation...
Curated OER
How Do You Find the Area of a Circle if You Know the Radius?
There are basically two things you need to know to find the area of a circle. First, you need to use the correct formula. Second, you have to know the value of the radius. If you know these two things then all you have to do is plug the...
Curated OER
How Do You Find the Area of a Circle if You Know the Diameter?
Do you know the formula to find the area of a circle? Do you know the value of pi? Do you know what the relationship is between diameter and radius? Yes? Then you can solve this problem. If your scholars don't know this formula then this...
Curated OER
What is the Formula for the Area of a Circle?
Cut up a circle and make a parallelogram! What? No way! Yes way! Watch the instructor illustrate just how to cut up the circle and get that parallelogram to then get the formula for the area of a circle. It really works! Base,...
Curated OER
Circumference by Math Busters
The Math Buster goes out and demonstrates a real life example of calculating circumference by walking around the edge of a circle, and compares it to walking from the edge of the circle to the center point. It is a visual demonstration,...
Khan Academy
Khan Academy: Trigonometry: Tau Versus Pi
This video explores pi and tau, and their relationship to the length of the arc of a circle, the sine graph, and Euler's formula. [16:22]
Khan Academy
Khan Academy: Geometry: Pi Is (Still) Wrong
An argument about why tau would be a better, more intuitive circle constant to use instead of pi. [5:17]
University of Nottingham
Sixty Symbols: Symbols of Physics and Astronomy: Energy
A University of Nottingham physicist provides a brief definition of pi, along with its mathematical uses, and supplies many alternative ways of writing and calculating this important number. [5:08]
Science Friday Initiative
Science Friday: Happy Pi Day
A celebration of March 14, or 3.14, which is Pi Day. People on the street are questioned about their knowledge of pi, and we see how the Exploratorium in New York observes this special mathematics day. Aired Mar. 14, 2008 [17:50]
Math Mammoth
Math Mammoth: Pi and the Circumference of a Circle
Explains what pi is and models how to solve circumference problems. [8:12]
SciShow
Sci Show: 3 Ways Pi Can Explain Practically Everything
A video exploring how Pi can be used to study everyday science concepts such as planets, spheres, electrons etc. [4:53]
Virtual Nerd
Virtual Nerd: What Is the Formula for the Volume of a Cylinder?
Watch this tutorial to learn about the formula for the volume of a cylinder which is the same as the formula for the area of a circle. [5:33]
Virtual Nerd
Virtual Nerd: What Is the Formula for the Volume of a Sphere?
In this tutorial, learn how to use a cylinder with the same dimensions to find the formula for the volume of a sphere. [4:56]
Virtual Nerd
Virtual Nerd: Find the Circumference of a Circle if You Know the Diameter
It's easy to find the circumference of a circle if you know the diameter. Just plug in its value into the formula for the circumference of a circle to get the answer. This tutorial shows you how. [3:28]
Virtual Nerd
Virtual Nerd: Find the Circumference of a Circle if You Know the Radius
It's easy to find the circumference of a circle if you know the radius. Just plug the value for the radius into the formula and solve. This tutorial shows you how. [4:18]
Virtual Nerd
Virtual Nerd: How Do You Find the Area of a Sector of a Circle?
Take a look at this tutorial to discover how to find the area of a sector of a circle. [4:23]
Virtual Nerd
Virtual Nerd: What's an Irrational Number?
An irrational number is a number that cannot be written as a fraction. View this tutorial to see some examples and learn the definition and an important property of these special numbers. [2:06]
Virtual Nerd
Virtual Nerd: What Is Circumference?
The circumference of a circle is the distance around that circle. Take a look at this tutorial to discover the formulas for the circumference of a circle. [4:22]